Update the documentation to refer to 'python3'.

README.md

@@ -36,7 +36,7 @@ Note: 'sudo' may be needed for this. Once installed, the following command will
 
 Alternatively, PyQSO can be run (without installing) with:
 
-   `python bin/pyqso`
+   `python3 bin/pyqso`
 
 from PyQSO's base directory.
 
@@ -49,7 +49,7 @@ The PyQSO documentation is stored in the `docs` directory. It can be built with
 
 which will produce an HTML version of the documentation in `docs/build/html` that can be opened in a web browser.
 
-Alternatively, a ready-built version of the PyQSO documentation can be found on [Read the Docs](http://pyqso.readthedocs.org/en/latest/).
+Alternatively, a ready-built version of the PyQSO documentation can be found on [Read the Docs](http://pyqso.readthedocs.io/).
 
 Dependencies
 ------------

docs/source/getting_started.rst

@@ -38,7 +38,7 @@ Alternatively, PyQSO can be run (without installing) with:
 
 .. code-block:: bash
 
-   python bin/pyqso
+   python3 bin/pyqso
 
 from PyQSO's base directory.
 

docs/source/introduction.rst

@@ -57,7 +57,7 @@ log.
 Licensing
 ---------
 
-PyQSO is free software, released under the GNU General Public License. Please see the file called ``COPYING`` for more information.
+PyQSO is free software, released under the `GNU General Public License <http://www.gnu.org/licenses/gpl-3.0.en.html>`_. Please see the file called ``COPYING`` for more information.
 
 Structure of this documentation
 -------------------------------