Fix:Typo in readme

README.rst

@@ -1,51 +1,51 b''
 .. image:: https://codecov.io/github/ipython/ipython/coverage.svg?branch=master
     :target: https://codecov.io/github/ipython/ipython?branch=master
 
 .. image:: https://img.shields.io/pypi/dm/IPython.svg           
     :target: https://pypi.python.org/pypi/ipython
 
 .. image:: https://img.shields.io/pypi/v/IPython.svg            
     :target: https://pypi.python.org/pypi/ipython
 
 .. image:: https://img.shields.io/travis/ipython/ipython.svg    
     :target: https://travis-ci.org/ipython/ipython
 
 
 ===========================================
  IPython: Productive Interactive Computing
 ===========================================
 
 Overview
 ========
 
 Welcome to IPython.  Our full documentation is available on `ipython.readthedocs.io
 <https://ipython.readthedocs.io/en/stable/>`_ and contains information on how to install, use and
 contribute to the project.
 
 Officially, IPython requires Python version 3.3 and above.
 IPython 5.x is the last IPython version to support Python 2.7.
 
 The Notebook, Qt console and a number of other pieces are now parts of *Jupyter*.
 See the `Jupyter installation docs <http://jupyter.readthedocs.io/en/latest/install.html>`__
 if you want to use these.
 
 
 
 
-Development and Instant runnimg
-================================
+Development and Instant runnig
+==============================
 
 You can find the latest version of the development documentation on `readthedocs
 <http://ipython.readthedocs.io/en/latest/>`_. 
 
 You can run IPython from this directory without even installing it system-wide
 by typing at the terminal::
     
    $ python -m IPython
 
 Or see the `development installation docs
 <http://ipython.readthedocs.io/en/latest/install/install.html#installing-the-development-version>`_
 for the latest revision on read the docs. 
 
 Documentation and installation instructions for older version of IPython can be
 found on the `IPython website <http://ipython.org/documentation.html>`_