Updating What's New for v3.9 release
Updated What's New (markdown)
Added description of aer_v_3.8 .
completed TES hisory
completed AER hisory
added aer v1.1
added all the way back to AER v2.0 and TES 1.4
added v3.2
added 3.4
added 3.4.1
added 3.5
added 3.6
Created What's New (markdown)