Readme updated with v1.5.0 and v2.0.0 links.

Version v1.4.3 (prescottprue#171)

* `onAuthStateChange` added to config validation
* deprecation warning added for `config.distpatchOnUnsetListener`

v2.0.0 Alpha 2 (prescottprue#168)

### Description
* `getFirebase` exposed to mirror `v1.*.*` API - prescottprue#167 
* Improved initialization - prescottprue#170 
* README Simplified
* More unit tests passing (including populate)
* Migration guide includes redux-persist example

### Check List

- [X] All tests passing
- [X] Docs updated with any changes or examples
- [X] Added tests to ensure feature(s) work properly

### Relevant Issues
* prescottprue#167
* prescottprue#170

Version v1.4.3 (prescottprue#171)

* `onAuthStateChange` added to config validation
* deprecation warning added for `config.distpatchOnUnsetListener`

Version v1.4.2 (prescottprue#164)

* Fixes an issue that when attempting to query on Windows in Internet Explorer would cause error with message "isNan is not a method of Number"

v2.0.0 alpha (prescottprue#162)

* Basic Population working with new syntax (`populate`)
* Material example uses new syntax (no helpers)
* A firebase instance can be passed (pass Firebase instance as first argument for `reactReduxFirebase` when creating store)
* Unused helpers removed (`populatedDataToJS`, `dataToJS`, `customToJS`)

Version v1.4.1 (prescottprue#159)

* Adds `transform-object-assign` to babel plugins to fix issue with IE - prescottprue#158 
* Removes npm publish  from `.travis.yml` (handled manually so that flags can be used) -
 prescottprue#155
* Removes duplicate API docs from `book` folder (introduced in prescottprue#156)

Version v1.5.0 Beta 3 (prescottprue#154)

* Switched to using `.npmignore` instead of `files` and `filesMap` fields in package.json to get typescript typings to be published - prescottprue#142

v1.5.0-alpha.2 (prescottprue#146)

### Description
Removed `browser` field from `package.json` in attempt to solve prescottprue#128 

### Check List

- [X] All tests passing
- [X] Docs updated with any changes or examples

### Relevant Issues
* [prescottprue#128](https://github.com/prescottprue/react-redux-firebase/issues/#128)

Fixed typo in connect docs

* fixes  prescottprue#141, prescottprue#145