Regenerate gemspec for version 0.17.2
Regenerate gemspec for version 0.17.2

aevy/nylas-ruby,nylas/nylas-ruby,nylas/nylas-ruby,aevy/nylas-ruby,hartator/nylas-ruby,aevy/nylas-ruby,stevenharman/nylas-ruby,hartator/nylas-ruby,hartator/nylas-ruby