Restrict upper bound for lens to < 4.4

Hi,

due to latest changes in lens 4.4 wreq does unfortunately no longer build with that version.

I adjusted the upper bound to lens >= 4.1 && < 4.4 and bumped the version in the cabal file from 0.2.1.0 to 0.2.1.1.

The error is that lens 4.4 does no longer define `defaultRules` in Control.Lens.TH.  See also the release notes here: http://www.reddit.com/r/haskell/comments/2e9918/lens_44_release_notes/

Best,
Markus