Change version to 0.7.6.rc1
Add Duane Nykamp to AUTHORS/aboutus/mailmap. Welcome to SymPy!
reposition Leonid Blouvshtein in AUTHORS/aboutus
Retroactively add Peter Brady to AUTHORS/aboutus. Welcome to SymPy!
Retroactively add Clemens Novak to AUTHORS/aboutus. Welcome to SymPy!
Retroactively add Craig A. Stoudt to AUTHORS/aboutus. Welcome to SymPy!
Retroactively add Raj to AUTHORS/aboutus. Welcome to SymPy!
Retroactively add immerrr to AUTHORS/aboutus. Welcome to SymPy!
Retroactively add Peleg Michaeli to AUTHORS/aboutus. Welcome to SymPy!
Retroactively add Chai Wah Wu to AUTHORS/aboutus. Welcome to SymPy!
Retroactively add zsc347 to AUTHORS/aboutus. Welcome to SymPy!
Retroactively add Hamish Dickson to AUTHORS/aboutus. Welcome to SymPy!
update mailmap