Remove unnecessary return definitions

[meooow25]

The default return=pure works and we are long past the Functor-Applicative-Monad Proposal.

[meooow25]

I was about to remove Seq's (>>) = (*>) but realized that the default is unfortunately not that but m >> k = m >>= \_ -> k. *sigh*

[treeowl]

I was about to remove Seq's (>>) = (*>) but realized that the default is unfortunately not that but m >> k = m >>= \_ -> k. sigh

It's not at all unusual to have to write (*>) = (>>) either. Thinking is unfortunately required for these.