Releaes 0.1.2

Bug fixes:

• Return correct error code when killed
• Don't allow bridging the same channel or room twice

New features:

• Improve error logging by printing stack trace
• Mattermost bot should reject direct messages too
• Leave channels when removed from bridge

Others:

• Code cleanup and use eslint

Note: This release was previously incorrectly tagged 0.1.2 instead of v0.1.2

Release 0.1.1

Bug fixes:

• Fix bug where default values of config options are not used; the values are
  left undefined if they are not set

New Features:

• Improve configurability of username and display names
• Add script to change mattermost usernames of puppets
• Improve mattermost username sanitization algorithm

Release 0.1.0

Initial release. Basic features are present and usable, but not necessarily stable.