Make pouchdb-browser dependency more flexible

[alxndrsn]

Fix for #114

[coveralls]

Coverage remained the same at 86.957% when pulling 9cd9569 on alxndrsn:soft-couch-dependency into 98d8eaa on angular-pouchdb:master.

[alxndrsn]

@tlvince we're using angular-pouchdb at https://github.com/medic and would be happy to help maintain.

cc @SCdF @garethbowen

[tlvince]

This makes sense, thanks. Please could you do the same in bower.json and reformat the commit per conventional commits (so that's picked up by semantic-release). This should probably be a chore type, but I'm fine for it to go through as a fix if you're depending on it :)

[coveralls]

Coverage remained the same at 86.957% when pulling f984b26 on alxndrsn:soft-couch-dependency into 98d8eaa on angular-pouchdb:master.

[alxndrsn]

I guess fix is more appropriate as it's changing the style of dependency rather than just updating the version number.

Is the new commit message suitable?

[coveralls]

Coverage remained the same at 86.957% when pulling 4691e72 on alxndrsn:soft-couch-dependency into 98d8eaa on angular-pouchdb:master.

[tlvince]

lgtm. Thanks!

[alxndrsn]

👍 Thanks!