coconatfly 0.2.4

What's Changed

• Handle missing partners in cf_cosine_plot() by @jefferis in #36
• Fill in instance column across datasets by @jefferis in #39
• warn but still complete without errors when there are no partners at all for
  inputs or ouptuts in cf_partners(). An example of when this happens is when
  running cf_cosine_plot() for sensory neurons where all the inputs are below
  threshold. #36
• suggest malecns >= 0.3.3 (https://github.com/flyconnectome/malecns/releases/tag/v0.3.3)
  to prefer manc types for ANs + SAs (see flyconnectome/malecns#28)

Full Changelog: v0.2.3...v0.2.4