Update version number to 1.10.15

Author: rdb

README.md

@@ -37,7 +37,7 @@ easiest way to deal with this is by setting your SPHINXBUILD variable something
 like so (adjust for the location of your Python build):
 
 ```
-set SPHINXBUILD=C:\Panda3D-1.10.14-x64\python\python.exe -m sphinx
+set SPHINXBUILD=C:\Panda3D-1.10.15-x64\python\python.exe -m sphinx
 ```
 
 ## Editing the Documentation

conf.py

@@ -82,7 +82,7 @@
 version = '1.10'
 
 # The full X.Y.Z version.
-release = '1.10.14'
+release = '1.10.15'
 
 # Whether to generate Python or C++ documentation.  TODO:
 tags.add('python')