added Travis status badge

mpibpc-mroose · mpibpc-mroose · commit 45ca4d20d5da · 2018-08-29T15:28:40.000+02:00
diff --git a/README.md b/README.md
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 # Nagios Plugin for MessPC.de Ethernet Boxes
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+[![Build Status](https://travis-ci.org/mpibpc-mroose/nagios_plugin_pcmeasure.svg?branch=master)](https://travis-ci.org/mpibpc-mroose/nagios_plugin_pcmeasure)
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 An implementation for Perl already exists:
 https://exchange.nagios.org/directory/Plugins/Hardware/Environmental/MessPC--2F-pcmeasure/details
 
