Separate the vue-class-component decorator into its own package.

This takes the decorator implementation contributed in
foxbenjaminfox/vue-async-computed#88 and
puts it into its own package. It also adds a few tests for the decorator.

Author: foxbenjaminfox

Diff for: .babelrc

@@ -0,0 +1,6 @@
+{
+  "plugins": [
+    "@babel/plugin-transform-runtime",
+    ["@babel/plugin-proposal-decorators", { "legacy": true }]
+  ]
+}

Diff for: .eslintrc

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+{
+  "extends": "standard",
+  "env": {
+    "node": true,
+    "es6": true
+  },
+  "rules": {
+    "comma-dangle": [
+      2,
+      "only-multiline"
+    ],
+    "one-var": 0
+  }
+}

Diff for: .gitignore

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+.DS_Store
+*.log
+node_modules/
+/.cache/
+/test/dist/

Diff for: .travis.yml

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+language: node_js
+node_js:
+  - v12
+  - v10
+  - v8

Diff for: LICENSE

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+Copyright (c) 2019 Benjamin Fox <[email protected]>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.))

Diff for: README.md

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+<big><h1 align="center">vue-async-computed-decorator</h1></big>
+
+<p align="center">
+  <a href="https://npmjs.org/package/vue-async-computed-decorator">
+    <img src="https://img.shields.io/npm/v/vue-async-computed-decorator.svg?style=flat-square"
+         alt="NPM Version">
+  </a>
+
+  <a href="https://travis-ci.org/foxbenjaminfox/vue-async-computed-decorator">
+    <img src="https://img.shields.io/travis/foxbenjaminfox/vue-async-computed-decorator.svg?style=flat-square"
+         alt="Build Status">
+  </a>
+
+  <a href="https://npmjs.org/package/vue-async-computed-decorator">
+    <img src="https://img.shields.io/npm/dm/vue-async-computed-decorator.svg?style=flat-square"
+         alt="Downloads">
+  </a>
+
+  <a href="https://david-dm.org/foxbenjaminfox/vue-async-computed-decorator.svg">
+    <img src="https://david-dm.org/foxbenjaminfox/vue-async-computed-decorator.svg?style=flat-square"
+         alt="Dependency Status">
+  </a>
+
+  <a href="https://github.com/foxbenjaminfox/vue-async-computed-decorator/blob/master/LICENSE">
+    <img src="https://img.shields.io/npm/l/vue-async-computed-decorator.svg?style=flat-square"
+         alt="License">
+  </a>
+</p>
+
+This package provides a [`vue-class-component`](https://github.com/vuejs/vue-class-component/) decorator for [`vue-async-computed`](https://github.com/foxbenjaminfox/vue-async-computed). This allows you to use `vue-async-computed` in your class-style Vie components easily.
+
+## Usage Example:
+
+```javascript
+import Vue from 'vue'
+import AsyncComputedPlugin from 'vue-async-computed'
+import AsyncComputed from 'vue-async-computed-decorator'
+import Component from 'vue-class-component'
+
+Vue.use(AsyncComputedPlugin)
+
+@Component
+class MyComponent extends Vue {
+  @AsyncComputed
+  async someComputedProp() {
+    ...
+  }
+}
+```
+
+## Credits
+
+Thanks to [@TheNoim](https://github.com/TheNoim), [@saraedum](https://github.com/saraedum), and [@nwtgck](https://github.com/nwtgck) for the implementation of this decorator.