Updated README

Author: pawelad

README.md

@@ -1,5 +1,6 @@
 # python-ivona-api
 [![Build status](https://img.shields.io/travis/Pythonity/python-ivona-api.svg)][travis]
+[![Test coverage](https://img.shields.io/coveralls/Pythonity/python-ivona-api.svg)][coveralls]
 [![PyPI version](https://img.shields.io/pypi/v/ivona_api.svg)][pypi]
 [![Python versions](https://img.shields.io/pypi/pyversions/ivona_api.svg)][pypi]
 [![License](https://img.shields.io/github/license/Pythonity/python-ivona-api.svg)][license]
@@ -12,30 +13,35 @@ It currently only implements `CreateSpeech` and `ListVoices` endpoints,
 as they should cover the vast majority of use cases. Lexicons endpoints
 may be added in the future.
 
-If you're looking for out-of-the-box solution, have a look at
+If you're looking for out-of-the-box solution, you should probably use
 [ivona-speak][ivona speak] - it's a script that uses this library and lets you
 use its functionality directly from your shell.
 
 ## Installation
 With PyPI:
+
 ```
 $ pip install ivona_api
 ```
 
 ## API
-There's no documentation as of now, but the code is commented and
-*should* be pretty straightforward to use.
+There's no documentation as of now, but the code is commented and *should* be 
+pretty straightforward to use.
 
-But feel free to ask [me](mailto:[email protected]) if anything
+That said - feel free to ask [me](mailto:[email protected]) if anything
 is unclear.
 
 ## Tests
-Package was tested with the help of `py.test` and `tox` on Python 2.7, 3.4
-and 3.5 (see `tox.ini`).
+Package was tested with the help of `py.test` and `tox` on Python 2.7, 3.4, 3.5
+and 3.6 (see `tox.ini`).
 
 To run tests yourself you need to set environment variables with secret
 and access keys before running `tox`:
+
+Code coverage is available at [Coveralls][coveralls].
+
 ```shell
+$ pip install -r requirements/dev.txt
 $ export IVONA_ACCESS_KEY="YOUR_ACTUAL_ACCESS_KEY"
 $ export IVONA_SECRET_KEY="YOUR_ACTUAL_SECRET_KEY"
 $ tox
@@ -45,14 +51,15 @@ $ tox
 Package source code is available at [GitHub][github].
 
 Feel free to use, ask, fork, star, report bugs, fix them, suggest enhancements,
-add functionality and point out any mistakes.
+add functionality and point out any mistakes. Thanks!
 
 ## Authors
 Developed and maintained by [Pythonity][pythonity].
 
 Written by [Paweł Adamczak][pawelad].
 
 
+[coveralls]: https://coveralls.io/github/Pythonity/python-ivona-api
 [github]: https://github.com/Pythonity/python-ivona-api
 [ivona keys]: http://developer.ivona.com/en/speechcloud/introduction.html#Credentials
 [ivona speak]: https://github.com/Pythonity/ivona-speak