Add wdm in Gemfile.lock
Add wdm in Gemfile.lock

For Windows users. This fixes a failed build in Travis CI, while keeping
support for Windows users

MaximeKjaer/MaximeKjaer.github.io,MaximeKjaer/kjaer.io,MaximeKjaer/kjaer.io,MaximeKjaer/kjaermaxi.me,MaximeKjaer/kjaermaxi.me,MaximeKjaer/kjaer.io,MaximeKjaer/MaximeKjaer.github.io,MaximeKjaer/MaximeKjaer.github.io,MaximeKjaer/MaximeKjaer.github.io,MaximeKjaer/kjaer.io,MaximeKjaer/kjaermaxi.me,MaximeKjaer/kjaermaxi.me