Add zipsafe to setup.py (#109)

* Add zip_safe into setup.py

Adding the keyword was proposed by pyroma. Setting it to True is probably
harmless, as there's nothing but Python in the package.

* Escape star character in README.rst

This error was kindly reported by pyroma.

* Add Python3.6 to the list of supported versions

README.rst

@@ -768,7 +768,7 @@ Revisions:
     - Better support under Python 3.x for in-memory PDF file-like objects
     - Some pagemerge and Unicode patches added
     - Changes to logging allow better coexistence with other packages
-    - Fix for "from pdfrw import *"
+    - Fix for "from pdfrw import \*"
     - New fancy_watermark.py example shows off capabilities of pagemerge.py
     - metadata.py example renamed to cat.py
 

setup.py

@@ -36,4 +36,5 @@
         'Topic :: Utilities',
     ],
     keywords='pdf vector graphics PDF nup watermark split join merge',
+    zip_safe=True,
 )