Update ask.py

TautologicalHandler is in _val_template + "common" + TautologicalHandler
Merge pull request #7336 from sevaader/patch-1

Update ask.py
Add sevaader to the AUTHORS/aboutus. Welcome to SymPy!
Merge branch 'dsolve_fixes_pullable' of ssh://github.com/zanzibar7/sympy into dsolve_fixes_pullable