Version 0.3.4 - ICS ATT&CK

• Added ICS_ATTACK collection "02c3ef24-9cd4-48f3-a99f-b74ce24f1d34"
• Added ICS ATTACK functions to extract techniques, relationships, groups, malware, mitigations and tactics
• Updated all-functions to include ICS collection
• Updated Readthedocs to automatically build docs for the python module attack_api (classes and functions)
  • https://attackcti.readthedocs.io/en/latest/attackcti_functions.html
• Updated Requirements files to download latest/current versions of stix2 (2.1.0) and taxii2-client (2.2.2)
• Updated attacktci version to 0.3.4 and pandas to 1.1.4 in docker container used for BinderHub