More LICENSE renaming

Author: edenhill

setup.py

@@ -22,7 +22,7 @@
       url='https://github.com/confluentinc/confluent-kafka-python',
       ext_modules=[module],
       packages=find_packages(exclude=("tests",)),
-      data_files=[('', ['LICENSE'])],
+      data_files=[('', ['LICENSE.txt'])],
       extras_require={
           'avro': ['fastavro', 'requests', avro]
       })