Update version and add communities requirement

Bump version from 0.1.4.6 to 0.1.4.7 and add communities as an extra requirement.

Signed-off-by: Yujia Zheng <yjzheng19@gmail.com>

Author: kunwuz

setup.py

@@ -3,7 +3,7 @@
 with open('README.md', 'r') as fh:
     README = fh.read()
 
-VERSION = '0.1.4.6'
+VERSION = '0.1.4.7'
 
 setuptools.setup(
     name='causal-learn',
@@ -24,9 +24,11 @@
         'pydot',
         'tqdm',
         'momentchi2',
-        'communities',
         'joblib'
     ],
+    extras_require={
+        'communities': ['communities'],
+    },
     url='https://github.com/py-why/causal-learn',
     packages=setuptools.find_packages(),
     classifiers=[