docs(release): update doc version from 1.2.0 to 1.3.0-beta.1 [skip ci]

node_modules/is-plain-obj/readme.md

@@ -0,0 +1,35 @@
+# is-plain-obj [![Build Status](https://travis-ci.org/sindresorhus/is-plain-obj.svg?branch=master)](https://travis-ci.org/sindresorhus/is-plain-obj)
+
+> Check if a value is a plain object
+
+An object is plain if it's created by either `{}`, `new Object()` or `Object.create(null)`.
+
+
+## Install
+
+```
+$ npm install --save is-plain-obj
+```
+
+
+## Usage
+
+```js
+var isPlainObj = require('is-plain-obj');
+
+isPlainObj({foo: 'bar'});
+//=> true
+
+isPlainObj([1, 2, 3]);
+//=> false
+```
+
+
+## Related
+
+- [is-obj](https://github.com/sindresorhus/is-obj) - Check if a value is an object
+
+
+## License
+
+MIT © [Sindre Sorhus](http://sindresorhus.com)