Relax upper bounds on Lens to 4.7

Signed-off-by: Alexander Berntsen <alexander@plaimi.net>
hsimport 0.6.4

Signed-off-by: Alexander Berntsen <alexander@plaimi.net>
Update CHANGELOG

Signed-off-by: Alexander Berntsen <alexander@plaimi.net>
Merge pull request #8 from alexander-b/master

Relax Lens's upper bounds & release new version