v3.7.1

SymbolicUtils v3.7.1

Diff since v3.7.0

Merged pull requests:

• Fix occursin for needle as a number case (#651) (@ChrisRackauckas)

Closed issues:

• Link back to repo from website (#52)
• simplify this to zero (#130)
• Don't print a * b in latex, print a b (#293)
• Latex output could be better for some operations (#294)
• Documentation on re-writing does not behave as expected (#420)