travis: upgrade to Go 1.13.1

davecheney · davecheney · commit af0b10ce545e · 2019-10-03T14:57:43.000+10:00
Signed-off-by: Dave Cheney &lt;dave@cheney.net&gt;
diff --git a/.travis.yml b/.travis.yml
@@ -1,7 +1,7 @@
 language: go
 go_import_path: github.com/heptio/contour
 go:
-  - 1.12.x
+  - 1.13.x
 
 sudo: false
 
