Bump snap dependency upper bound
Bump the snap dependency upper bound, for real

The previous commit does nothing.
Keep snap-0.10 as lower bound
Merge pull request #11 from zopa/master

Bump snap dependency to include 0.11
Relaxed the 'lens' dependency.
Merge
Merged from adinapoli + updated example + cosmetical changes
Relaxed constraints do allow installation with Snap 0.12