Update Guava to 20.0 snapshot version 20160818.201422-323

Change-Id: I9786b1312771fd75b3a00c98e625c0df49a8a76c

lib/BUCK

diff --git a/lib/BUCK b/lib/BUCK
index aaef023..20ac74c 100644
--- a/lib/BUCK
+++ b/lib/BUCK
@@ -66,9 +66,10 @@
 
 maven_jar(
   name = 'guava',
-  id = 'com.google.guava:guava:19.0',
-  sha1 = '6ce200f6b23222af3d8abb6b6459e6c44f4bb0e9',
+  id = 'com.google.guava:guava:20.0:20160818.201422-323',
+  sha1 = '13af7470db1026c57aedd0144018e06fe79bba33',
   license = 'Apache2.0',
+  repository = MAVEN_SNAPSHOT,
 )
 
 maven_jar(