Upgrade soy to 2019-04-18

Change-Id: I49e638e9d90f6cd2cc2ef5e0dd5d924b2e6a28a7

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index 5f6de1d..3ee16c0 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -130,8 +130,8 @@
 
 maven_jar(
     name = "soy",
-    artifact = "com.google.template:soy:2019-03-11",
-    sha1 = "119ac4b3eb0e2c638526ca99374013965c727097",
+    artifact = "com.google.template:soy:2019-04-18",
+    sha1 = "5750208855562d74f29eee39ee497d5cf6df1490",
 )
 
 maven_jar(