I would suggest 1.1.0-SNAPSHOT

Totally your guys call, but I feel like you should increment the middle number of future development.  The third digit should be only for bug fixes (which can be generated from a branch off the last tag, with the bug fix cherry-picked in).

If you want the final digit to only be bug fixes, then if anyone does further work, they must implicitly know to increment the version as well (which can be tricky with an open source project).