changelog and setup -> 0.3.7

Merge pull request astropy#1020 from keflavich/nrao_multiple_options

Allow multiple entries in NRAO queries

create v0.3.6.post2

version 0.3.6.post1

Tagging v0.3.6

[ci skip] update version in setup

version 0.3.4

release version

changelog & version # setting