Also add util/bot/golang to .gitignore.

I missed this one.

Change-Id: I642fb5878568870743727579126f63246ff179c5
Reviewed-on: https://boringssl-review.googlesource.com/12580
Commit-Queue: David Benjamin <[email protected]>
Reviewed-by: Adam Langley <[email protected]>

Author: davidben

.gitignore

@@ -12,6 +12,7 @@ util/bot/cmake-mac
 util/bot/cmake-mac.tar.gz
 util/bot/cmake-win32
 util/bot/cmake-win32.zip
+util/bot/golang
 util/bot/gyp
 util/bot/llvm-build
 util/bot/perl-win32