Switch the project license from CC0 to MIT (#43)

LICENSE

@@ -1,116 +1,21 @@
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+MIT License
+
+Copyright (c) 2011-2023 Hajime Senuma
+
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README.md

@@ -89,7 +89,9 @@ Beware that `hash64` returns **two** values, because it uses the 128-bit version
 See [CHANGELOG.md](./CHANGELOG.md) for the complete changelog.
 
 ## License
-[CC0-1.0](./LICENSE).
+[MIT](./LICENSE), unless otheriwise noted within a file.
+
+Note that as of 2023-03-30, the most recent official release of mmh3 is Version 3.1.0, which is released under CC0-1.0.
 
 ## Known Issues
 ### Getting different results from other MurmurHash3-based libraries
@@ -117,15 +119,10 @@ Be careful so that these seeds do not exceed 32-bit. Unexpected results may happ
 ```
 
 ## Authors
-MurmurHash3 was originally developed by Austin Appleby and distributed under public domain.
-
-* <https://github.com/aappleby/smhasher>
+MurmurHash3 was originally developed by Austin Appleby and distributed under public domain [https://github.com/aappleby/smhasher](https://github.com/aappleby/smhasher]).
 
 Ported and modified for Python by Hajime Senuma.
 
-* <http://pypi.python.org/pypi/mmh3>
-* <http://github.com/hajimes/mmh3>
-
 ## See also
 ### Tutorials (High-Performance Computing)
 The following textbooks and tutorials are great sources to learn how to use mmh3 (and other hash algorithms in general) for high-performance computing.

deps/MurmurHash3.cpp

@@ -7,6 +7,10 @@
 // compile and run any of them on any platform, but your performance with the
 // non-native version will be less than optimal.
 
+// This file contains several minor changes made by mmh3 developers.
+// Any issues caused by these changes should be reported to
+// https://github.com/hajimes/mmh3/issues, not to the original author.
+
 #include "MurmurHash3.h"
 
 //-----------------------------------------------------------------------------

deps/MurmurHash3.h

@@ -2,6 +2,10 @@
 // MurmurHash3 was written by Austin Appleby, and is placed in the public
 // domain. The author hereby disclaims copyright to this source code.
 
+// This file contains several minor changes made by mmh3 developers.
+// Any issues caused by these changes should be reported to
+// https://github.com/hajimes/mmh3/issues, not to the original author.
+
 #ifndef MURMURHASH3_H_
 #define MURMURHASH3_H_
 

src/mmh3/mmh3module.cpp

@@ -1,9 +1,3 @@
-//-----------------------------------------------------------------------------
-// MurmurHash3 was written by Austin Appleby, and is placed in the public
-// domain. mmh3 Python module was written by Hajime Senuma,
-// and is also placed in the public domain/CC0 1.0.
-// The authors hereby disclaim copyright to these source codes.
-
 // This code currently conforms to the clang-format code style, not PEP 7
 
 // To handle 64-bit data; see https://docs.python.org/3/c-api/arg.html