Enable all warnings

.bazelci/presubmit.yml

diff --git a/.bazelci/presubmit.yml b/.bazelci/presubmit.yml
index 67277a4..1d35384 100644
--- a/.bazelci/presubmit.yml
+++ b/.bazelci/presubmit.yml
@@ -1,5 +1,7 @@
 ---
-buildifier: latest
+buildifier:
+  version: latest
+  warnings: "all"
 tasks:
   ubuntu1604:
     build_targets:

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index 2dfeff0..e4bdea6 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -1,25 +1,30 @@
 workspace(name = "rules_java")
 
 load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
 http_archive(
     name = "bazel_federation",
-    url = "https://github.com/bazelbuild/bazel-federation/archive/f0e5eda7f0cbfe67f126ef4dacb18c89039b0506.zip", # 2019-09-30
     sha256 = "33222ab7bcc430f1ff1db8788c2e0118b749319dd572476c4fd02322d7d15792",
     strip_prefix = "bazel-federation-f0e5eda7f0cbfe67f126ef4dacb18c89039b0506",
     type = "zip",
+    url = "https://github.com/bazelbuild/bazel-federation/archive/f0e5eda7f0cbfe67f126ef4dacb18c89039b0506.zip",  # 2019-09-30
 )
 
 load("@bazel_federation//:repositories.bzl", "rules_java_deps")
+
 rules_java_deps()
 
 load("@bazel_federation//setup:rules_java.bzl", "rules_java_setup")
+
 rules_java_setup()
 
 #
 # Dependencies for development of rules_java itself.
 #
 load("//:internal_deps.bzl", "rules_java_internal_deps")
+
 rules_java_internal_deps()
 
 load("//:internal_setup.bzl", "rules_java_internal_setup")
+
 rules_java_internal_setup()