remove extra whitespace

toolchains/unittest/BUILD

diff --git a/toolchains/unittest/BUILD b/toolchains/unittest/BUILD
index c90c66e..fbe3879 100644
--- a/toolchains/unittest/BUILD
+++ b/toolchains/unittest/BUILD
@@ -54,5 +54,5 @@
     srcs = [
         "BUILD",
     ],
-    visibility = ["//:__pkg__"],    
+    visibility = ["//:__pkg__"],
 )