Exclude COPYING.rst from sphinx's search.

Author: bgrant

conf.py

@@ -67,7 +67,7 @@
 
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.
-exclude_patterns = ['build', 'README.rst', 'examples.rst']
+exclude_patterns = ['build', 'README.rst', 'COPYING.rst', 'examples.rst']
 
 # The reST default role (used for this markup: `text`) to use for all
 # documents.