Format BUILD file with buildifier 0.12.0

Change-Id: If6999e395e27cd8255024d515ffc8f1cbdae2578
diff --git a/BUILD b/BUILD
index 202e13b..7fec2ea 100644
--- a/BUILD
+++ b/BUILD
@@ -1,9 +1,9 @@
 load("//tools/bzl:junit.bzl", "junit_tests")
 load(
     "//tools/bzl:plugin.bzl",
-    "gerrit_plugin",
     "PLUGIN_DEPS",
     "PLUGIN_TEST_DEPS",
+    "gerrit_plugin",
 )
 
 gerrit_plugin(