added image to docs

Author: corneliusyaovi

README.md

@@ -1,4 +1,8 @@
-# Rave_Python
+<p align="center">
+    <img title="Flutterwave" height="200" src="https://flutterwave.com/images/logo-colored.svg" width="50%"/>
+</p>
+
+# Rave Python Library
 
 ## Introduction
 This is a Python wrapper around the [API](https://flutterwavedevelopers.readme.io/v2.0/reference) for [Rave by Flutterwave](https://rave.flutterwave.com).