Add commons:lang3 library to the plugins exports

Making the library available for plugins out of the box.

Change-Id: Ibc90885cc1194d32fdbcad5a189dab444cacf354
diff --git a/plugins/BUILD b/plugins/BUILD
index 01ede06..0e5df2c 100644
--- a/plugins/BUILD
+++ b/plugins/BUILD
@@ -73,6 +73,7 @@
     "//lib/commons:compress",
     "//lib/commons:dbcp",
     "//lib/commons:lang",
+    "//lib/commons:lang3",
     "//lib/dropwizard:dropwizard-core",
     "//lib/flogger:api",
     "//lib/guice:guice",