README.md in pycall-1.1.0.rc1 vs README.md in pycall-1.2.0.beta1

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+<a name="logo"/>
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+<img src="./images/pycallrb_logo_200.png" alt="pycall.rb logo" width="200" height="200"></img>
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 # PyCall: Calling Python functions from the Ruby language
 
 [![Build Status](https://travis-ci.org/mrkn/pycall.rb.svg?branch=master)](https://travis-ci.org/mrkn/pycall.rb)
 [![Build status](https://ci.appveyor.com/api/projects/status/071is0f4iu0vy8lp/branch/master?svg=true)](https://ci.appveyor.com/project/mrkn/pycall.rb/branch/master)
 
 This library provides the features to directly call and partially interoperate
 with Python from the Ruby language.  You can import arbitrary Python modules
 into Ruby modules, call Python functions with automatic type conversion from
 Ruby to Python.
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+## Supported Ruby versions
+
+pycall.rb supports Ruby version 2.3 or higher.
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+## Supported Python versions
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+pycall.rb supports Python version 2.7 or higher.
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+Note that in Python 2.7 old-style class, that is defined without a super class, is not fully supported in pycall.rb.
 
 ## Installation
 
 Add this line to your application's Gemfile:
 