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This release contains the following new features:
* [101, 111] Add support for http_proxy and no_proxy environment
variables
* [109] message.channel can be compared to channel name or channel ID
* [138, 144] Messages from other bots could raise exceptions
* [141] The bot can now respond to users that joined after the bot logged
in
* [149] utils.download_file() now accepts an optional token parameter
* [136] Let slackbot add replies to a thread
* message.channel.upload_content() for uploading data without storing it in
a file first
* Official support for Python 3.6