Merge pull request #140 from mellon85/murmur3_extra

Murmur as an extra

Author: seperman

README.md

@@ -27,7 +27,7 @@ Tested on Python 3.4, 3.5, 3.6, 3.7, Pypy3
 
 DeepDiff prefers to use Murmur3 for hashing. However you have to manually install Murmur3 by running:
 
-`pip install mmh3`
+`pip install 'deepdiff[murmur]'`
 
 Otherwise DeepDiff will be using SHA256 for hashing which is a cryptographic hash and is considerably slower.
 

setup.py

@@ -43,6 +43,9 @@ def get_reqs(filename):
       long_description_content_type='text/markdown',
       install_requires=reqs,
       python_requires='>=3.4',
+      extras_require={
+          "murmur": ["mmh3"],
+      },
       classifiers=[
           "Intended Audience :: Developers",
           "Operating System :: OS Independent",