add go1.13 to the supported versions of go

Dj Gilcrease · Dj Gilcrease · commit 65f8d1ba9b87 · 2019-11-14T18:34:32.000-08:00
diff --git a/.travis.yml b/.travis.yml
@@ -3,6 +3,7 @@ language: go
 go:
   - "1.11"
   - "1.12"
+  - "1.13"
 
 go_import_path: gopkg.in/src-d/go-git.v4
 

-Original file line number
+Diff line change
 go:
   - "1.11"
   - "1.12"
 +  - "1.13"
 go_import_path: gopkg.in/src-d/go-git.v4