Updated version to 6.1

TBR=machenbach@chromium.org

Bug: 
Change-Id: I916d52297bd81c5015fcd3185105dcb0d0a3d78f
Reviewed-on: https://chromium-review.googlesource.com/513906Reviewed-by: Daniel Vogelheim <vogelheim@chromium.org>
Commit-Queue: Daniel Vogelheim <vogelheim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45520}

include/v8-version.h

@@ -9,7 +9,7 @@
 // NOTE these macros are used by some of the tool scripts and the build
 // system so their names cannot be changed without changing the scripts.
 #define V8_MAJOR_VERSION 6
-#define V8_MINOR_VERSION 0
+#define V8_MINOR_VERSION 1
 #define V8_BUILD_NUMBER 0
 #define V8_PATCH_LEVEL 0