Second release

Changelog:

• Update dev-tools protocol to latest version dev-tools-protocol#1aa7b31ca7
• Fix issue with parsing latest protocol
• Make parsing a JSON messages a bit loose - ignore unknown properties due to some properties not being defined in JSON protocol files
• Make event execution on single thread
• Fix websocket dependencies

First release

v1.2.0

Merge branch 'release-v1.2.0'