all: use go mod

nanmu42 · nanmu42 · commit dbe05df62707 · 2019-10-14T09:53:38.000+08:00
diff --git a/go.mod b/go.mod
@@ -0,0 +1,3 @@
+module github.com/nanmu42/etherscan-api
+
+go 1.13

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,3 @@`
	`1`	`+module github.com/nanmu42/etherscan-api`
	`2`	`+`
	`3`	`+go 1.13`