bump version for bug fixes

6 jobs for 2.1.1
latest
Status Job ID Name Coverage
  Test
canceled #3450
debian stable amd64
debian_stable_amd64_deb

canceled #3449
debian stable i386
debian_stable_i386_deb

canceled #3454
osx v10.11 dmg
osx_amd64_dmg

canceled #3452
ubuntu v14.04 amd64
ubuntu_14.04_amd64_deb

canceled #3451
ubuntu v14.04 i386
ubuntu_14.04_i386_deb

canceled #3453
ubuntu v16.04 amd64
ubuntu_16.04_amd64_deb