Add a go.mod file (joho#123)

joho · web-flow · commit 65218afbaa9b · 2020-11-11T14:54:56.000+11:00
diff --git a/go.mod b/go.mod
@@ -0,0 +1,3 @@
+module github.com/joho/godotenv
+
+go 1.12

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,3 @@`
	`1`	`+module github.com/joho/godotenv`
	`2`	`+`
	`3`	`+go 1.12`