Remove bazel-genfiles from .gitignore

Change-Id: I19999e2a2f0b9220bf5c2679abc742ae85694d5b

.gitignore

diff --git a/.gitignore b/.gitignore
index 826ed2e..43d62c1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,5 @@
 bazel-bin
 bazel-example*
-bazel-genfiles
 bazel-out
 bazel-testlogs
 *.idea