docs/conf.py: update version to 3.8

llvm-svn: 242240
diff --git a/clang/docs/conf.py b/clang/docs/conf.py
index b7ed23a..edb2d37 100644
--- a/clang/docs/conf.py
+++ b/clang/docs/conf.py
@@ -48,9 +48,9 @@
 # built documents.
 #
 # The short X.Y version.
-version = '3.7'
+version = '3.8'
 # The full version, including alpha/beta/rc tags.
-release = '3.7'
+release = '3.8'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.