update CHANGES.txt for v1.1.1.18

STIXProject · May 1, 2020 · 1bd7d6f · 1bd7d6f
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+Version 1.1.1.18
+2020-05-01
+- #366 Check add_reference methods to prevent NoneType has no attribute 'append'
+- Changes to STIXPackage to prevent the empty <stix:TTPs/> tag from appearing in serialization
+
 Version 1.1.1.17
 2020-04-21
 - #365 AISMarkingStructure not serializing correctly. PY3 compatibility issue