v2.2.0
new release (#1649) * Update VERSION.txt * Update DESCRIPTION * Update .appveyor.yml * Update .appveyor.yml * Update DESCRIPTION * Update VERSION.txt * Update .appveyor.yml * Update DESCRIPTION * Update VERSION.txt * Update DESCRIPTION
new release (#1649) * Update VERSION.txt * Update DESCRIPTION * Update .appveyor.yml * Update .appveyor.yml * Update DESCRIPTION * Update VERSION.txt * Update .appveyor.yml * Update DESCRIPTION * Update VERSION.txt * Update DESCRIPTION