Fix formatting for "username <email>" in cabal file

Added a space between $author and <$email> in Author and Maintainer
directives in cabal file.

$author and <$email> generally have a space between them.  For example,
git commit message, email messages, the hashable library's cabal file,
and the lens library's cabal file.
Merge pull request #1 from cdepillabout/formatting_fix

Fix formatting for "username <email>" in cabal file