[monitoring-plugins] Merge branch 'upstream' into check_curl

[Sven Nierlein]

 Module: monitoring-plugins
 Branch: feature_check_curl
 Commit: 53e6f2970dcbabd41d55d87b2e7623a86fe48ec9
 Author: Sven Nierlein <s...@nierlein.de>
   Date: Fri May 15 11:46:54 2020 +0200
    URL: 
https://www.monitoring-plugins.org/repositories/monitoring-plugins/commit/?id=53e6f29

Merge branch 'upstream' into check_curl

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