v0.4.2

This release brings a selection of fixes and new features:

Fixes:

• Now correctly handles windows style newlines in news for displaying
  note titles and lines
• tempfile file extension should now be more accurate when editing notes
  (for markdown vs plaintxt notes)
• python dependency updates
• workarounds documented for running on Windows

New features:

• Simplenote credentials may now be stored in environment variables,
  as an alternative to the configuration file.
  For example:

  SN_USERNAME=lebowski@thedude.com SN_PASSWORD=nihilist ./sncli
  

• new option to default to markdown for new notes
  (cfg_default_markdown = yes)

• Dockerfile for running sncli in a Docker container.

Thanks to all contributors who made this possible:

@gregwebs @wyattwalter @lostways @pataquets @clach04

:)