add changelog entry for jplsdb merge
- JPLHorizons: JPL server protocol and epoch range bug fixes, user-defined
location and additional ephemerides information added [#1207]
- MAST: Fixing bug in catalog criteria querues, and updating remote tests. [#1223]
+- JPLSDB: New module for querying JPL's Small Body Database Browser [#1214]
0.3.8 (2018-04-27)
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