Update docs version to 7.0

git-svn-id: https://llvm.org/svn/llvm-project/libunwind/trunk@321732 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/conf.py b/docs/conf.py
index 29c95f3..c3b51fc 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -47,9 +47,9 @@
 # built documents.
 #
 # The short X.Y version.
-version = '6.0'
+version = '7.0'
 # The full version, including alpha/beta/rc tags.
-release = '6.0'
+release = '7.0'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.