Merge pull request #70 from codacy-badger/codacy-badge

Add a Codacy badge to README.md

README.md

@@ -1,4 +1,5 @@
 # Paypay OPA SDK - Node
+[![Codacy Badge](https://api.codacy.com/project/badge/Grade/b17690606bb64c51a1c65c65a8a75b1f)](https://app.codacy.com/gh/paypay/paypayopa-sdk-node?utm_source=github.com&utm_medium=referral&utm_content=paypay/paypayopa-sdk-node&utm_campaign=Badge_Grade_Settings)
 [![License](https://img.shields.io/:license-apache2.0-red.svg)](https://opensource.org/licenses/Apache-2.0)
 [![npm](https://img.shields.io/npm/v/@paypayopa/paypayopa-sdk-node)](https://www.npmjs.com/package/@paypayopa/paypayopa-sdk-node)
 [![Build Status](https://travis-ci.org/paypay/paypayopa-sdk-node.svg?branch=master)](https://travis-ci.org/paypay/paypayopa-sdk-node)