Bring Go current in Travis

gliptak · clareliguori · commit 73f7530e1eb4 · 2019-05-08T06:38:17.000-07:00
diff --git a/.travis.yml b/.travis.yml
@@ -6,7 +6,7 @@ services:
 go_import_path: github.com/awslabs/aws-lambda-container-image-converter
 
 go:
-    - 1.11.x
+    - 1.12.x
 
 script:
     - make install-deps
