fix typo

Author: pinocchio338

README.md

@@ -115,7 +115,7 @@ The project uses [Mocha](https://mochajs.org/) to run your unit tests, it uses [
 
 To run the tests in the project, just simply run `npm test` if you have `Chrome` installed, it will be automatically launched as a test service for you.
 
-To keep watching your test suites that you are working, just set `singleRun: false` in the `karma.conf.js` file. Please be sure set it to `true` if you are running `npm test` on a continuous integration server (travis-ci, etc).
+To keep watching your test suites that you are working on, just set `singleRun: false` in the `karma.conf.js` file. Please be sure set it to `true` if you are running `npm test` on a continuous integration server (travis-ci, etc).
 
 ## The Future