Add the version number to go.mod

lhchavez · lhchavez · commit 84b7f456735e · 2020-08-16T07:19:20.000-07:00
This is the second take on trying to tag the current release with a Go version. (cherry picked from commit a32375a)
diff --git a/go.mod b/go.mod
@@ -1 +1,3 @@
 module github.com/libgit2/git2go/v28
+
+go 1.13

Original file line number	Diff line number	Diff line change
`@@ -1 +1,3 @@`
`1`	`1`	`module github.com/libgit2/git2go/v28`
	`2`	`+`
	`3`	`+go 1.13`