Werk #11378: Added new notification method: signl4

Component	Notifications
Title	Added new notification method: signl4
Date	Nov 10, 2020
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

For further information please take a look at SIGNL4.

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