Some new features and a notice about needing a new maintainer

Pip-review now defers to pip list -o for updates. Woohoo!

Enables python -m pip and deprecated Python 2.6 support

Restores the green build status, thanks to @Flimm (jgonggrijp#37)

Bugfix and preparation release.

  - **breaking** pip-review used to contain a bug that caused it to
    report available updates when the installed version was newer
    than the latest available from PyPI. This is not the case anymore;
    it only reports available updates when a *newer* version is
    available. (jgonggrijp#10 jgonggrijp#29 jgonggrijp#30 jgonggrijp#31)
  - Packages like pip, setuptools and wheel are not ignored by
    `pip-review` anymore. (jgonggrijp#9 jgonggrijp#13 jgonggrijp#16)
  - Broken output formatting in Windows has been fixed. (jgonggrijp#14 jgonggrijp#16 jgonggrijp#17)
  - pip-review now explicitly depends on pip. (jgonggrijp#16)
  - Some changes were made to the test suite to make it more future-
    proof. (jgonggrijp#15 jgonggrijp#34 jgonggrijp#35 jgonggrijp#36)
  - The CONTRIBUTING.md was updated.
  - The HISTORY.md was deprecated in favor of tag messages and GitHub
    release notes. It will be removed in a future release. This tag
    contains its final version.

Credits: @xoviat @bil-elmoussaoui @Flimm

This release fixes compatibility with Windows and old pip versions.

Ignores pre-release versions unless the --pre flag is passed

Pip-review lives on as a separate package

This is 0.3.6

Tag version 0.3.5.