Removing healthchecks - not selfhosted

- not self hosted
- not free (has some free tire)

README.md

@@ -189,7 +189,6 @@ _Related: [Internet of Things (IoT)](#internet-of-things-iot), [Software Develop
 - [feed2toot](https://feed2toot.readthedocs.io/en/latest/) - Feed2toot parses a RSS feed, extracts the last entries and sends them to Mastodon. ([Source Code](https://gitlab.com/chaica/feed2toot)) `GPL-3.0` `Python`
 - [feedmixer](https://github.com/cristoper/feedmixer) - FeedMixer is a WSGI (Python3) micro web service which takes a list of feed URLs and returns a new feed consisting of the most recent n entries from each given feed(Returns Atom, RSS, or JSON). ([Demo](https://mretc.net/feedmixer/json?f=https://hnrss.org/newest&f=https://americancynic.net/atom.xml&n=1)) `WTFPL` `Python`
 - [Headphones](https://github.com/rembo10/headphones) - Automated music downloader for NZB and Torrent, written in Python. It supports SABnzbd, NZBget, Transmission, µTorrent, Deluge and Blackhole. `GPL-3.0` `Python`
-- [Healthchecks](https://healthchecks.io/) - Django app which listens for pings and sends alerts when pings are late. ([Source Code](https://github.com/healthchecks/healthchecks)) `BSD-3-Clause` `Python`
 - [homebank-converter](https://github.com/Binnette/homebank-converter) - Web app to convert an export bank file to compatible Homebank csv. ([Demo](https://binnette.github.io/homebank-converter/)) `AGPL-3.0` `HTML5`
 - [HRConvert2](https://github.com/zelon88/HRConvert2) - Drag-and-drop file conversion server with session based authentication, automatic temporary file maintenance, and logging capability. `GPL-3.0` `PHP`
 - [Huginn](https://github.com/huginn/huginn) - Allows you to build agents that monitor and act on your behalf. `MIT` `Ruby`