Update Guava to 19.0

Change-Id: I54dab66495e5fbd2e307762e1ae30951488d9701

lib/BUCK

diff --git a/lib/BUCK b/lib/BUCK
index a14b356..2e4205f 100644
--- a/lib/BUCK
+++ b/lib/BUCK
@@ -12,8 +12,8 @@
 
 maven_jar(
   name = 'guava',
-  id = 'com.google.guava:guava:18.0',
-  sha1 = 'cce0823396aa693798f8882e64213b1772032b09',
+  id = 'com.google.guava:guava:19.0',
+  sha1 = '6ce200f6b23222af3d8abb6b6459e6c44f4bb0e9',
 )
 
 maven_jar(