Update documentation for v1.13.0

PiperOrigin-RevId: 502644180
Change-Id: Id20b5e4eec22035da278f1767002657f66dbe79c

README.md

@@ -15,13 +15,12 @@ Our documentation is now live on GitHub Pages at
 https://google.github.io/googletest/. We recommend browsing the documentation on
 GitHub Pages rather than directly in the repository.
 
-#### Release 1.12.1
+#### Release 1.13.0
 
-[Release 1.12.1](https://github.com/google/googletest/releases/tag/release-1.12.1)
-is now available.
+[Release 1.13.0](https://github.com/google/googletest/releases/tag/v1.13.0) is
+now available.
 
-The 1.12.x branch will be the last to support C++11. Future releases will
-require at least C++14.
+The 1.13.x branch requires at least C++14.
 
 #### Coming Soon
 

googletest/README.md

@@ -25,7 +25,7 @@ When building GoogleTest as a standalone project, the typical workflow starts
 with
 
 ```
-git clone https://github.com/google/googletest.git -b release-1.12.1
+git clone https://github.com/google/googletest.git -b v1.13.0
 cd googletest        # Main directory of the cloned repository.
 mkdir build          # Create a directory to hold the build output.
 cd build