Werk #8646: cmk-update-agent: Added -V / --version to output the version of the plugin

Component	Agent bakery
Title	cmk-update-agent: Added -V / --version to output the version of the plugin
Date	Dec 8, 2016
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i3 Checkmk Enterprise (CEE), Checkmk MSP (CME)

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