Upgrade io_bazel_rules_go dependency to 0.16.5 (#405)

diff --git a/WORKSPACE b/WORKSPACE
index e4eb615..4f8434e 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -4,8 +4,8 @@
 
 http_archive(
     name = "io_bazel_rules_go",
-    sha256 = "f87fa87475ea107b3c69196f39c82b7bbf58fe27c62a338684c20ca17d1d8613",
-    urls = ["https://github.com/bazelbuild/rules_go/releases/download/0.16.2/rules_go-0.16.2.tar.gz"],
+    sha256 = "7be7dc01f1e0afdba6c8eb2b43d2fa01c743be1b9273ab1eaf6c233df078d705",
+    urls = ["https://github.com/bazelbuild/rules_go/releases/download/0.16.5/rules_go-0.16.5.tar.gz"],
 )
 
 load("@io_bazel_rules_go//go:def.bzl", "go_register_toolchains", "go_rules_dependencies")