Revert "updated the description in the .cabal file"

This reverts commit 290ac1ad23413ca3418773076aa3f2b709bb5803.
Switched to the Diff visualization from the Diff package (instead of the homegrown one)
Added semicolon after 'return' statement in the pretty printer
version bump
added parenthesis around IntLit's used as objects in DotRef when pretty-printing
version bumps