add import pkg_resources

[Findus23]

same as hannorein/rebound#499

[coveralls]

Coverage increased (+11.3%) to 81.856% when pulling dfd99ed on Findus23:pkg_resources into 3ee6998 on dtamayo:master.

[codecov-io]

Codecov Report

Merging #57 (dfd99ed) into master (3ee6998) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #57   +/-   ##
=======================================
  Coverage   75.57%   75.57%           
=======================================
  Files          40       40           
  Lines        3586     3587    +1     
=======================================
+ Hits         2710     2711    +1     
  Misses        876      876           

Impacted Files	Coverage Δ
reboundx/__init__.py	89.65% <100.00%> (+0.36%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 3ee6998...dfd99ed. Read the comment docs.

[hannorein]

Well spotted. I think this should be unproblematic to merge.

[dtamayo]

Thanks! Sorry not sure why this got missed.