Upgrade soy to 2019-08-22

Change-Id: I0984f5c1d9e05bd04e7f7a92ad3c8386c49ec902

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index 2b176f4..003dd07 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -130,8 +130,8 @@
 
 maven_jar(
     name = "soy",
-    artifact = "com.google.template:soy:2019-07-14",
-    sha1 = "547dee679bac6011126f3a54619d3aec336216d0",
+    artifact = "com.google.template:soy:2019-08-22",
+    sha1 = "d4bf390caf7aa448108a5b9ec1b51f46820438f3",
 )
 
 maven_jar(