himach v0.2.1

Since the last Github release, there have been:

himach 0.2.1

• Patch so that tests work ok with sf v1.0+.

himach 0.2.0

• More precise estimate of time penalty for acceleration from subsonic to supersonic cruise (or v.v.). Perhaps 1% difference in timings as a result.
• Faster map plots, since maps are simplified (a little) now, by default.