Merge "Upgrade javassist to 3.20.0-GA"

lib/BUCK

diff --git a/lib/BUCK b/lib/BUCK
index 0c424ad..65bdd5e 100644
--- a/lib/BUCK
+++ b/lib/BUCK
@@ -257,8 +257,8 @@
 
 maven_jar(
   name = 'javassist',
-  id = 'org.javassist:javassist:3.18.1-GA',
-  sha1 = 'd9a09f7732226af26bf99f19e2cffe0ae219db5b',
+  id = 'org.javassist:javassist:3.20.0-GA',
+  sha1 = 'a9cbcdfb7e9f86fbc74d3afae65f2248bfbf82a0',
   license = 'DO_NOT_DISTRIBUTE',
 )