remove trigger (unmaintained since 2018)

README.md

@@ -579,7 +579,6 @@ _See also: [IT Asset Management]([Ralph](#it-asset-management))_
 - [phpIPAM](http://phpipam.net/) - Open source IP address management with PowerDNS integration. ([Source Code](https://github.com/phpipam/phpipam)) `GPL-3.0` `PHP`
 - [RANCID](http://www.shrubbery.net/rancid/) - Monitors network device's configuration and maintain history of changes. ([Source Code](https://github.com/haussli/rancid)) `BSD-3-Clause` `Perl/Shell`
 - [rConfig](http://www.rconfig.com/) - Another network device configuration management tool. ([Source Code](https://github.com/rconfig/rconfig)) `GPL-3.0` `PHP`
-- [trigger](https://github.com/trigger/trigger) - Robust network automation toolkit written in Python.
 
 
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