Update README to reflect the changes that came during the years

README.md

@@ -7,14 +7,12 @@ Picomon is a very small and minimal alerting tool
 Dependencies
 ------------
 
-Written in Python, it needs at least python 3.2 for the ThreadPools.
-
-On Debian Wheezy the package is `python3`.
+Written in Python, it needs at least python 3.2 (for the ThreadPools) and is tested under Debian Wheezy to Buster.
 
 Some checks are implemented using Nagios' checks,
-available under Debian in package `nagios-plugins-basic`.
+available under Debian in package `monitoring-plugins-basic`.
 
-The DNS zone check calls [Bortzmeyer's](https://github.com/bortzmeyer/check_dns_soa)
+The DNS zone check calls [Stéphane Bortzmeyer](https://www.bortzmeyer.org)'s [check_dns_soa](https://framagit.org/bortzmeyer/check_dns_soa)
 (introduced [here](http://www.bortzmeyer.org/go-dns-icinga.html)).
 
 The OpenVPN check calls [Liquidat's](https://github.com/liquidat/nagios-icinga-openvpn/).
@@ -67,7 +65,7 @@ Please note that this will cancel the current `base_tick` sleeping period
 and thus trigger a new run.
 
 
-Alert emails
+Email alerts
 ------------
 
 An email can be sent each time a check switches to error state or recovers from