s/COPYING.txt/COPYING.rst

MANIFEST.in

@@ -1,5 +1,5 b''
 include README.rst
-include COPYING.txt
+include COPYING.rst
 include setupbase.py
 include setupegg.py
 

setup.py

@@ -14,7 +14,7 b' requires utilities which are not available under Windows."""'
 #
 #  Distributed under the terms of the Modified BSD License.
 #
-#  The full license is in the file COPYING.txt, distributed with this software.
+#  The full license is in the file COPYING.rst, distributed with this software.
 #-----------------------------------------------------------------------------
 
 #-----------------------------------------------------------------------------