v1.8.1

This is the first v1.8 patch release (v1.8.1) catching up an overlooked PR.

Improvements:

• Added all valid expert system hits to the final dbxrefs and JSON results: #198 #199 (Thanks @davidtong28)

Important:
#199 introduced a breaking change in the JSON data structure of the feature->expert section. expert was changed from a dictionary (expert system -> hit) to a flat list of expert hits now having a new type field.