docs: add wait section add query by text (#172)

<!-- What changes are being made? (What feature/bug is being fixed here?) -->

**What**:

"Wait" section was missing `queryByText` destructuring assignment, example doesn't work without it.
https://github.com/kentcdodds/react-testing-library#wait

**Why**:

added the missing queryByText assignment.

**How**:

Edited the README.md manually and run `npm run add-contributor` to update contributors file (following https://github.com/kentcdodds/react-testing-library/blob/master/CONTRIBUTING.md)

**Checklist**:
- [x] Documentation
- [x] Tests
- [x] Ready to be merged
- [x] Added myself to contributors table

Author: petermakowski

.all-contributorsrc

@@ -475,6 +475,15 @@
       "contributions": [
         "doc"
       ]
+    },
+    {
+      "login": "petermakowski",
+      "name": "Peter Makowski",
+      "avatar_url": "https://avatars3.githubusercontent.com/u/7452681?v=4",
+      "profile": "https://github.com/petermakowski",
+      "contributions": [
+        "doc"
+      ]
     }
   ]
 }

README.md

@@ -15,7 +15,7 @@
 [![version][version-badge]][package] [![downloads][downloads-badge]][npmtrends]
 [![MIT License][license-badge]][license]
 
-[![All Contributors](https://img.shields.io/badge/all_contributors-48-orange.svg?style=flat-square)](#contributors)
+[![All Contributors](https://img.shields.io/badge/all_contributors-49-orange.svg?style=flat-square)](#contributors)
 [![PRs Welcome][prs-badge]][prs] [![Code of Conduct][coc-badge]][coc]
 [![Join the community on Spectrum][spectrum-badge]][spectrum]
 
@@ -164,8 +164,12 @@ You may also be interested in installing `jest-dom` so you can use
 
 ## Setup
 
-`react-testing-library` does not require any configuration to be used (as demonstrated in the example above). However, there are some things you can do to when configuring your testing framework to reduce some boilerplate. In these docs we'll demonstrate configuring Jest, but you should be able to do similar things with any testing framework (react-testing-library does not require that you use Jest).
-
+`react-testing-library` does not require any configuration to be used (as
+demonstrated in the example above). However, there are some things you can do to
+when configuring your testing framework to reduce some boilerplate. In these
+docs we'll demonstrate configuring Jest, but you should be able to do similar
+things with any testing framework (react-testing-library does not require that
+you use Jest).
 
 ### Global Config
 
@@ -176,9 +180,12 @@ assertions.
 
 To do this with Jest, you can add the
 [`setupTestFrameworkScriptFile`](https://facebook.github.io/jest/docs/en/configuration.html#setuptestframeworkscriptfile-string)
-option to your Jest config. The setup file can be anywhere, for example `jest.setup.js` or `./utils/setupTests.js`.
+option to your Jest config. The setup file can be anywhere, for example
+`jest.setup.js` or `./utils/setupTests.js`.
 
-If you are using the default setup from create-react-app, this option is set to `src/setupTests.js`. You should create this file if it doesn't exist and put the setup code there.
+If you are using the default setup from create-react-app, this option is set to
+`src/setupTests.js`. You should create this file if it doesn't exist and put the
+setup code there.
 
 ```javascript
 // jest.config.js
@@ -238,8 +245,8 @@ export {customRender as render}
 ```
 
 To make this file accessible without using relative imports, add the folder
-containing the file to the Jest `moduleDirectories` option. Note: this will
-make _all_ the .js files in that directory importable without `../`.
+containing the file to the Jest `moduleDirectories` option. Note: this will make
+_all_ the .js files in that directory importable without `../`.
 
 ```diff
 // my-component.test.js
@@ -641,7 +648,7 @@ import 'jest-dom/extend-expect'
 import {render, wait} from 'react-testing-library'
 
 test('can fill in the form after loaded', async () => {
-  const {getByLabelText} = render(<Login />)
+  const {queryByText, getByLabelText} = render(<Login />)
 
   // wait until the callback does not throw an error. In this case, that means
   // it'll wait until the element with the text that says "loading..." is gone.
@@ -1116,7 +1123,6 @@ light-weight, simple, and understandable.
 Thanks goes to these people ([emoji key][emojis]):
 
 <!-- ALL-CONTRIBUTORS-LIST:START - Do not remove or modify this section -->
-
 <!-- prettier-ignore -->
 | [<img src="https://avatars.githubusercontent.com/u/1500684?v=3" width="100px;"/><br /><sub><b>Kent C. Dodds</b></sub>](https://kentcdodds.com)<br />[💻](https://github.com/kentcdodds/react-testing-library/commits?author=kentcdodds "Code") [📖](https://github.com/kentcdodds/react-testing-library/commits?author=kentcdodds "Documentation") [🚇](#infra-kentcdodds "Infrastructure (Hosting, Build-Tools, etc)") [⚠️](https://github.com/kentcdodds/react-testing-library/commits?author=kentcdodds "Tests") | [<img src="https://avatars1.githubusercontent.com/u/2430381?v=4" width="100px;"/><br /><sub><b>Ryan Castner</b></sub>](http://audiolion.github.io)<br />[📖](https://github.com/kentcdodds/react-testing-library/commits?author=audiolion "Documentation") | [<img src="https://avatars0.githubusercontent.com/u/8008023?v=4" width="100px;"/><br /><sub><b>Daniel Sandiego</b></sub>](https://www.dnlsandiego.com)<br />[💻](https://github.com/kentcdodds/react-testing-library/commits?author=dnlsandiego "Code") | [<img src="https://avatars2.githubusercontent.com/u/12592677?v=4" width="100px;"/><br /><sub><b>Paweł Mikołajczyk</b></sub>](https://github.com/Miklet)<br />[💻](https://github.com/kentcdodds/react-testing-library/commits?author=Miklet "Code") | [<img src="https://avatars3.githubusercontent.com/u/464978?v=4" width="100px;"/><br /><sub><b>Alejandro Ñáñez Ortiz</b></sub>](http://co.linkedin.com/in/alejandronanez/)<br />[📖](https://github.com/kentcdodds/react-testing-library/commits?author=alejandronanez "Documentation") | [<img src="https://avatars0.githubusercontent.com/u/1402095?v=4" width="100px;"/><br /><sub><b>Matt Parrish</b></sub>](https://github.com/pbomb)<br />[🐛](https://github.com/kentcdodds/react-testing-library/issues?q=author%3Apbomb "Bug reports") [💻](https://github.com/kentcdodds/react-testing-library/commits?author=pbomb "Code") [📖](https://github.com/kentcdodds/react-testing-library/commits?author=pbomb "Documentation") [⚠️](https://github.com/kentcdodds/react-testing-library/commits?author=pbomb "Tests") | [<img src="https://avatars1.githubusercontent.com/u/1288694?v=4" width="100px;"/><br /><sub><b>Justin Hall</b></sub>](https://github.com/wKovacs64)<br />[📦](#platform-wKovacs64 "Packaging/porting to new platform") |
 | :---: | :---: | :---: | :---: | :---: | :---: | :---: |
@@ -1125,7 +1131,7 @@ Thanks goes to these people ([emoji key][emojis]):
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