Version 0.2.0

BREAKING FEATURES

• Calculation of data hash has changed (#53).
  You must use upgrade_data() to read data stored by an older version.
• is_git2rdata() and upgrade_data() do not test equality in data hashes any more (but read_vc() still does).
• write_vc() and read_vc() fail when file is a location outside of root (#50).
• Reordering factor levels requires strict = TRUE.

Bugfixes

• Linux and Windows machines now generated the same data hash (#49).

NEW FEATURES

• Internal sorting uses the "C" locale, regardless of the current locale.
• read_vc() reads older stored in an older version (#44).
  When the version is too old, it prompts to upgrade_data().
• Improve warnings() and error() messages.
• Use vector version of logo.