[doc] Installation link

README.md

@@ -1,10 +1,13 @@
-[![Gitter](https://badges.gitter.im/substantic/rain.svg)](https://gitter.im/substantic/rain?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 
+<div align="center">
+<img style="width: 250px;" src="docs/imgs/logo.svg?sanitize=true">
+</div>
 
-# Rain
+-----------------
 
-<img style="vertical-align: center; padding: 2em; width: 320px;" src="docs/imgs/logo.svg?sanitize=true">
+[![Gitter](https://badges.gitter.im/substantic/rain.svg)](https://gitter.im/substantic/rain?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 
+# Rain
 
 **Rain** is an open-source distributed computational framework for processing
 of large-scale task-based pipelines.

docs/guide/install.rst

@@ -21,11 +21,7 @@ It can be downloaded and unpacked as follows:
 
 Installation of Python API::
 
-  $ git clone https://github.com/substantic/rain.git
-  $ cd ./rain/python
-  $ python3 setup.py install
-
-We do not provide .whl nor .egg Python package at the moment.
+$ pip3 install https://github.com/substantic/rain/releases/download/v0.1.0/rain-0.1.0-py3-none-any.whl
 
 Build from sources
 ==================