Add Fider (#1101)

* Adding fidder

* fix missing char

* use https

README.md

@@ -946,6 +946,7 @@ See https://github.com/n1trux/awesome-sysadmin#metric--metric-collection
 
   * [Calagator](http://calagator.org/) - An event aggregator. ([Demo](http://calagator.org/), [Source code](https://github.com/calagator/calagator)) `MIT` `Ruby`
   * [dudle](http://primelife.ercim.eu/results/opensource/63-dudle) - An online scheduling application. ([Demo](https://dudle.inf.tu-dresden.de/)) `AGPLv3` `Ruby`
+  * [Fider](http://getfider.com) - An open source alternative to UserVoice for customer feedback. ([Demo](https://demo.fider.io), [Source Code](https://github.com/getfider/fider)) `MIT` `Go`
   * [Framadate](https://framadate.org/) - An online service for planning an appointment or make a decision quickly and easily: Make a poll, Define dates or subjects to choose, Send the poll link to your friends or colleagues, Discuss and make a decision. ([Demo](https://framadate.org/aqg259dth55iuhwm), [Source Code](https://git.framasoft.org/framasoft/framadate)) `CeCILL-B` `PHP`
   * [Kyélà](http://kyela.net/) - Participation polls for group events. ([Demo](http://kyela.net/55232734237c8/), [Source Code](https://github.com/abienvenu/Kyela)) `AGPLv3` `PHP`
   * [LimeSurvey](https://www.limesurvey.org) - Feature-rich Open Source web based polling software. Supports extensive survey logic. ([Demo](https://demo.limesurvey.org)) `GPLv2` `PHP`