Update README.md

Code1110 · Jun 25, 2016 · 3092e88 · 3092e88
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-# nodemcu-max7219
-A NodeMCU library to write to MAX7219 8x8 matrix displays using SPI
+# NodeMCU MAX7219
+[![License](https://img.shields.io/badge/license-MIT-blue.svg?style=flat)](https://github.com/marcelstoer/nodemcu-max7219/blob/master/LICENSE)
+
+### A NodeMCU library to write to MAX7219 8x8 matrix displays using SPI