Change license from MIT to BSD 3 Clause

Author: VuqarAhadli

README.md

@@ -1537,7 +1537,7 @@ esptool.py --port /dev/ttyUSB0 erase_flash
 
 ### License
 
-MIT License — see repository for full text.
+BSD 3 Clause — see repository for full text.
 
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