quick 0.2.4. release

[orbeckst]

I suggest we make a quick 0.2.4 release that contains

• update Python support #124
• timeout related fixes and error propogation improvements #120
  and the doc updates,

Then do a 0.3.0 release with the IMDv2 #141 support.

[orbeckst]

Released 0.2.4 https://github.com/Becksteinlab/imdclient/releases/tag/v0.2.4

• PyPi 0.2.4 https://pypi.org/project/imdclient/
• conda-forge (check imdclient v0.2.4 conda-forge/imdclient-feedstock#5)