fix minor typo in README.rst

README.rst

@@ -1,110 +1,110 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.
 
 **IPython versions and Python Support**
 
 **IPython 6** requires Python version 3.3 and above.
 
 **IPython 5.x LTS** is the compatible release for Python 2.7.
 If you require Python 2 support, you **must** use IPython 5.x LTS. Please
 update your project configurations and requirements as necessary.
 
 
 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 running
 ===============================
 
 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>`_
 
 
 
 IPython requires Python version 3 or above
 ==========================================
 
 Starting with version 6.0, IPython does not support Python 2.7, 3.0, 3.1, or
 3.2.
 
 For a version compatible with Python 2.7, please install the 5.x LTS Long Term
 Support version.
 
 If you are encountering this error message you are likely trying to install or
 use IPython from source. You need to checkout the remote 5.x branch. If you are
 using git the following should work:
 
   $ git fetch origin
   $ git checkout -b origin/5.x
 
 If you encounter this error message with a regular install of IPython, then you
 likely need to update your package manager, for example if you are using `pip`
 check the version of pip with
 
   $ pip --version
 
 You will need to update pip to the version 9.0.1 or greater. If you are not using
 pip, please inquiry with the maintainers of the package for your package
 manager.
 
 For more information see one of our blog posts:
 
     http://blog.jupyter.org/2016/07/08/ipython-5-0-released/
 
 As well as the following Pull-Request for discussion:
 
     https://github.com/ipython/ipython/pull/9900
 
 This error does also occur if you are invoking ``setup.py`` directly – which you
 should not – or are using ``easy_install`` If this is the case, use ``pip
-isntall .`` (instead of ``setup.py install`` , and ``pip install -e .`` instead
+install .`` (instead of ``setup.py install`` , and ``pip install -e .`` instead
 of ``setup.py develop`` If you are depending on IPython as a dependency you may
 also want to have a conditional dependency on IPython depending on the Python
 version::
 
     install_req = ['ipython']
     if sys.version_info[0] < 3 and 'bdist_wheel' not in sys.argv:
         install_req.remove('ipython')
         install_req.append('ipython<6')
 
     setup(
         ...
         install_requires=install_req
     )