Edit readme

Made contents into a list.

Author: paulross

README.md

@@ -4,8 +4,8 @@ Examples of reliable coding of Python 'C' extensions by Paul Ross.
 
 ## Contents:
 
-Introduction to [reference counts](doc/sphinx/source/refcount.rst) in Python C extensions.
-Managing [exceptions](doc/sphinx/source/exceptions.rst).
-A [canonical function pattern](doc/sphinx/source/canonical_function.rst) for C extensions.
-Handling [function arguments](doc/sphinx/source/parsing_arguments.rst).
-Creating, setting and getting [module globals](doc/sphinx/source/module_globals.rst).
+* Introduction to [reference counts](doc/sphinx/source/refcount.rst) in Python C extensions.
+* Managing [exceptions](doc/sphinx/source/exceptions.rst).
+* A [canonical function pattern](doc/sphinx/source/canonical_function.rst) for C extensions.
+* Handling [function arguments](doc/sphinx/source/parsing_arguments.rst).
+* Creating, setting and getting [module globals](doc/sphinx/source/module_globals.rst).