Fix the build for bazel 0.16 (#1334)

Bazel 0.16 comes with java 1.9, which doesn't have javax/annotation/Generated,
which dagger 2.9 needed.
rules_closure 0.8.0 updates its dagger deps to 2.14.1, which resolves
the issue.

Author: r4nt

Diff for: WORKSPACE

@@ -2,11 +2,11 @@ workspace(name = "org_tensorflow_tensorboard")
 
 http_archive(
     name = "io_bazel_rules_closure",
-    sha256 = "a80acb69c63d5f6437b099c111480a4493bad4592015af2127a2f49fb7512d8d",
-    strip_prefix = "rules_closure-0.7.0",
+    sha256 = "b29a8bc2cb10513c864cb1084d6f38613ef14a143797cea0af0f91cd385f5e8c",
+    strip_prefix = "rules_closure-0.8.0",
     urls = [
-        "https://mirror.bazel.build/github.com/bazelbuild/rules_closure/archive/0.7.0.tar.gz",
-        "https://github.com/bazelbuild/rules_closure/archive/0.7.0.tar.gz",  # 2018-05-09
+        "https://mirror.bazel.build/github.com/bazelbuild/rules_closure/archive/0.8.0.tar.gz",
+        "https://github.com/bazelbuild/rules_closure/archive/0.8.0.tar.gz",  # 2018-08-03
     ],
 )