Add first class support for golang hooks

testing/resources/golang_hooks_repo/.pre-commit-hooks.yaml

@@ -0,0 +1,5 @@
+-   id: golang-hook
+    name: golang example hook
+    entry: golang-hello-world
+    language: golang
+    files: ''

testing/resources/golang_hooks_repo/golang-hello-world/main.go

@@ -0,0 +1,17 @@
+package main
+
+
+import (
+	"fmt"
+	"github.com/BurntSushi/toml"
+)
+
+type Config struct {
+	What string
+}
+
+func main() {
+	var conf Config
+	toml.Decode("What = 'world'\n", &conf)
+	fmt.Printf("hello %v\n", conf.What)
+}