Bump to error-prone plugin 0.0.13 to kill a deprecation warning.
diff --git a/annotations/build.gradle b/annotations/build.gradle
index 0c317b5..f4d2b60 100644
--- a/annotations/build.gradle
+++ b/annotations/build.gradle
@@ -1,5 +1,5 @@
 plugins {
-    id "net.ltgt.errorprone" version "0.0.11"
+    id "net.ltgt.errorprone" version "0.0.13"
 }
 
 new RoboJavaModulePlugin(