Bump gems dependency to 1.1.0
Bump gems dependency to 1.1.0

This release includes fix for JSON parser error when rubygems.org
returns incorrect result.
https://github.com/rubygems/gems/pull/41

travis-ci/dpl,computology/dpl,travis-ci/dpl,testfairy/dpl,testfairy/dpl,testfairy/dpl,travis-ci/dpl