assorted minor changes

[svigeland]

I made the following changes:

• Change to get_lnprior() function to fix deprecation warning
• Changed how pulsar distance is set based on the pulsar name to account for the fact that the 5-yr data set doesn't include the B or J prefixes in the pulsar names
• Updated the entry for PINT in the requirements.txt file to reflect the fact that PINT can be installed with pip install pint-pulsar

[codecov[bot]]

Codecov Report

Merging #245 (c6cadc5) into master (e1ca16f) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #245   +/-   ##
=======================================
  Coverage   85.56%   85.56%           
=======================================
  Files          12       12           
  Lines        2723     2723           
=======================================
  Hits         2330     2330           
  Misses        393      393           

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[vallis]

Hmm... coverage still not reported correctly. We're assume it's an original sin (given this PR happened before the coverage process changes), and merge.