.travis.yml: bump go version

nelsam · nelsam · commit 80a2f4b08eac · 2021-03-04T10:05:55.000-06:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,7 +1,7 @@
 language: go
 go:
-- "1.12.x"
-- "1.13.x"
+- "1.15.x"
+- "1.16.x"
 - tip
 
 matrix:
