v0.3.0

Changes:

• parsing MIME type from gemini response instead of just checking for "text/".
  Other text types will now be displayed as text/plain, not text/gemini.
  This also allows the supposed encoding to be detected and ncgopher will now abort
  a request if the server signals an unsupported charset. A dialog will be displayed.

Bugfixes:

• Fixed bug in gopher protocol handling