Add Patrick Poitras to .mailmap
Fix .mailmap for Thomas Hisch
Add Sushant Hiray to AUTHORS/aboutus/.mailmap. Welcome to SymPy!
Fix .mailmap for Anurag Sharma
Add Abhinav Chanda to the AUTHORS/aboutus. Welcome to SymPy!
Add Jim Crist to AUTHORS/aboutus/.mailmap. Welcome to SymPy!
Add Sudhanshu Mishra to the AUTHORS/aboutus. Welcome to SymPy!
Add Soumya Dipta Biswas to the AUTHORS/aboutus. Welcome to SymPy!
mailmap_update.py doesn't work for old git versions, warning was added
change git --version requirements
remove the else condition and added the is.Boolean condition to general Basic instances.
Removed redundant tests count_ops(Basic()) = S.zero
Removed trailing whitespaces, will always check them first.
Merge pull request #7253 from jcrist/issue7249

Changed lambdastr to use dummy for all symbols if dummify=True (fixes #7249)
Added the cases to handle the exception of True and False, who were behaving as logic function.
Fixed the bug.
Merge pull request #7323 from skirpichev/mailmap

AUTHORS/.mailmap/aboutus updated
Merge branch 'master' of https://github.com/sympy/sympy
Update Zeel Shah in AUTHORS/aboutus/.mailmap
Merge pull request #2970 from curiousguy13/play

fix docstring of is_zero()