Updated README with developers logo

Author: ech0s7r

README.md

@@ -1,5 +1,5 @@
 # oauth1-signer-python
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+[![](https://developer.mastercard.com/_/_/src/global/assets/svg/mcdev-logo-dark.svg)](https://developer.mastercard.com/)
 
 [![](https://github.com/Mastercard/oauth1-signer-python/workflows/Build%20&%20Test/badge.svg)](https://github.com/Mastercard/oauth1-signer-python/actions?query=workflow%3A%22Build+%26+Test%22)
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