update googletest readme to fix broken links

googletest/README.md

@@ -54,7 +54,7 @@ it.
 ### Using CMake ###
 
 Google Test comes with a CMake build script (
-[CMakeLists.txt](master/CMakeLists.txt)) that can be used on a wide range of platforms ("C" stands for
+[CMakeLists.txt](CMakeLists.txt)) that can be used on a wide range of platforms ("C" stands for
 cross-platform.). If you don't have CMake installed already, you can
 download it for free from <http://www.cmake.org/>.
 
@@ -136,7 +136,7 @@ these macros are named like `GTEST_XYZ` and you define them to either 1
 or 0 to enable or disable a certain feature.
 
 We list the most frequently used macros below.  For a complete list,
-see file [include/gtest/internal/gtest-port.h](https://github.com/google/googletest/blob/master/include/gtest/internal/gtest-port.h).
+see file [include/gtest/internal/gtest-port.h](include/gtest/internal/gtest-port.h).
 
 ### Choosing a TR1 Tuple Library ###