Format bzl files with buildifier 0.12.0

Change-Id: Ic6888d5338b20dfdee1bd7ab65c544c4e041530a

tools/stamper.bzl

diff --git a/tools/stamper.bzl b/tools/stamper.bzl
index ecbf75d..5b4d3a1 100644
--- a/tools/stamper.bzl
+++ b/tools/stamper.bzl
@@ -2,19 +2,19 @@
 load("@com_googlesource_gerrit_bazlets//tools:genrule2.bzl", "genrule2")
 
 def stamp(workspace, name):
-  # TODO(davido): Remove manual merge of manifest file when this feature
-  # request is implemented: https://github.com/bazelbuild/bazel/issues/2009
-  genrule2(
-    name = "%s-stamped" % name,
-    stamp = 1,
-    srcs = [":%s" % name],
-    cmd = " && ".join([
-      "GEN_VERSION=$$(cat bazel-out/stable-status.txt | grep -w STABLE_BUILD_%s_LABEL | cut -d ' ' -f 2)" % workspace.upper(),
-      "cd $$TMP",
-      "unzip -q $$ROOT/$<",
-      "echo \"Implementation-Version: $$GEN_VERSION\n$$(cat META-INF/MANIFEST.MF)\" > META-INF/MANIFEST.MF",
-      "zip -qr $$ROOT/$@ ."]),
-    outs = ["%s-stamped.jar" % name],
-    visibility = ["//visibility:public"],
-  )
-
+    # TODO(davido): Remove manual merge of manifest file when this feature
+    # request is implemented: https://github.com/bazelbuild/bazel/issues/2009
+    genrule2(
+        name = "%s-stamped" % name,
+        stamp = 1,
+        srcs = [":%s" % name],
+        cmd = " && ".join([
+            "GEN_VERSION=$$(cat bazel-out/stable-status.txt | grep -w STABLE_BUILD_%s_LABEL | cut -d ' ' -f 2)" % workspace.upper(),
+            "cd $$TMP",
+            "unzip -q $$ROOT/$<",
+            "echo \"Implementation-Version: $$GEN_VERSION\n$$(cat META-INF/MANIFEST.MF)\" > META-INF/MANIFEST.MF",
+            "zip -qr $$ROOT/$@ .",
+        ]),
+        outs = ["%s-stamped.jar" % name],
+        visibility = ["//visibility:public"],
+    )