Upgrade guava to 23.0

Change-Id: I043e88df0489c3341ea6e20bf3221a8c8186e0e2

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index 2f8621b..45be964 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -28,8 +28,8 @@
 
 maven_jar(
     name = "guava",
-    artifact = "com.google.guava:guava:22.0",
-    sha1 = "3564ef3803de51fb0530a8377ec6100b33b0d073",
+    artifact = "com.google.guava:guava:23.0",
+    sha1 = "c947004bb13d18182be60077ade044099e4f26f1",
 )
 
 maven_jar(