add bool support

implement/gjson_read.go

@@ -74,6 +74,14 @@ func (g *gjsonRead) Float(dataPath string) (float64, error) {
 	return gjson_hack.Float64(g.gjsonResult.Get(dataPath))
 }
 
+func (g *gjsonRead) Bool(dataPath string) (bool, error) {
+	res := g.gjsonResult.Get(dataPath)
+	if !res.IsBool() {
+		return false, errors.New(dataPath + ": is not a bool")
+	}
+	return res.Bool(), nil
+}
+
 func (g *gjsonRead) String(dataPath string) (string, error) {
 	if !g.Exist(dataPath) {
 		return "", errors.New(dataPath + ": not found")