Fix crc32c's __main__ for Python 3

Author: Jongy

kafka/record/_crc32c.py

@@ -138,8 +138,12 @@ def crc(data):
 
 
 if __name__ == "__main__":
+    import six
     import sys
     # TODO remove the pylint disable once pylint fixes
     # https://github.com/PyCQA/pylint/issues/2571
-    data = sys.stdin.read()  # pylint: disable=assignment-from-no-return
+    if six.PY2:
+        data = sys.stdin.read()  # pylint: disable=assignment-from-no-return
+    else:
+        data = sys.stdin.buffer.read()  # pylint: disable=assignment-from-no-return
     print(hex(crc(data)))