Version bump to 0.4.0
Version bump to 0.4.0

ajhodges/inbox-ruby,williamhogman/inbox-ruby,singjsong/inbox-ruby,ajhodges/inbox-ruby,ajhodges/inbox-ruby,nylas/nylas-ruby,williamhogman/inbox-ruby,aevy/nylas-ruby,stevenharman/nylas-ruby,aevy/nylas-ruby,singjsong/inbox-ruby,aevy/nylas-ruby,williamhogman/inbox-ruby,singjsong/inbox-ruby,nylas/nylas-ruby,hartator/nylas-ruby,hartator/nylas-ruby,hartator/nylas-ruby