Update travis for Go 1.15 (pquerna#58)

pquerna · web-flow · commit bd63651f7d7b · 2020-11-10T19:01:25.000-08:00
diff --git a/.travis.yml b/.travis.yml
@@ -7,4 +7,4 @@ env:
   - GO111MODULE=on
 
 go:
-  - "1.12"
+  - "1.15"

-Original file line number
+Diff line change
   - GO111MODULE=on
 go:
 -  - "1.12"
 +  - "1.15"