Default source file encoding in Python 2 is ASCII (#70)

* The copyright symbol was causing SyntaxError: Non-ASCII character '\xc2' on Python 2.7

* Change copyright symbol to (C)

Author: glynn-zenefits

src/rapidfuzz/process.py

@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: MIT
-# Copyright © 2020 Max Bachmann
-# Copyright © 2011 Adam Cohen
+# Copyright (C) 2020 Max Bachmann
+# Copyright (C) 2011 Adam Cohen
 
 from rapidfuzz import fuzz, utils
 from rapidfuzz.cpp_impl import extractOne