[sec] update 'ws' dependency as a there is a security issue.

Created by: M5oul

There is a security issue with 'ws' module
Upgrade ws dependency to 1.1.5 which fix it.

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Concerning migrating it to last versions 2 and 3, here is changelogs:

• https://github.com/websockets/ws/releases/tag/2.0.0
• https://github.com/websockets/ws/releases/tag/3.0.0

We could update it to 3.3.1. greping the code, ws.open and ws.send methods are used.

Created by: coveralls

Coverage increased (+0.03%) to 79.213% when pulling 67247c8c on ws_update into 4702dcec on dev.

@M5oul I just used cherry-pick to copy your commit on branch 1.6. The next time you want to propose a security path that can't wait uses the "version" branch