Fix name of commons-io dependency

The name was changed from commons_io to commons-io in gerrit
core change I1e75690fe.

Change-Id: Ia2f8d74f9dacca1aae96ae33ca1c097bd0bdaf32
diff --git a/BUILD b/BUILD
index d74d150..0371641 100644
--- a/BUILD
+++ b/BUILD
@@ -40,7 +40,7 @@
     # resources = glob(['src/test/resources/**/*']),
     tags = ["findowners"],
     deps = PLUGIN_DEPS + PLUGIN_TEST_DEPS + [
-        "@commons_io//jar",
+        "@commons-io//jar",
         ":find-owners-lib",
         ":find-owners-prolog-rules",
     ],