Bump guice-multibindings to final 4.0 release

Change-Id: I613ef55da5e091b2764195dbcbf4b24ccf1ed85b
diff --git a/BUCK b/BUCK
index 4e69319..1b9dbf0 100644
--- a/BUCK
+++ b/BUCK
@@ -40,8 +40,8 @@
 
 maven_jar(
   name = 'guice-multibindings',
-  id = 'com.google.inject.extensions:guice-multibindings:4.0-beta5',
-  sha1 = 'f432356db0a167127ffe4a7921238d7205b12682',
+  id = 'com.google.inject.extensions:guice-multibindings:4.0',
+  sha1 = 'f4509545b4470bbcc865aa500ad6fef2e97d28bf',
   license = 'Apache2.0',
   exclude_java_sources = True,
   exclude = [