Use python3 now by default.

README.rst

@@ -28,17 +28,6 @@ Usage::
 
   $ git clone https://github.com/modoboa/modoboa-installer
   $ cd modoboa-installer
-  $ sudo ./run.py <your domain>
-
-.. note::
-
-   On some systems (Ubuntu 20.04 for example), you might encounter the
-   following issue::
-
-     /usr/bin/env: 'python': No such file or directory
-
-   If so, try to run the command like this::
-
   $ sudo python3 run.py <your domain>
 
 A configuration file will be automatically generated the first time

run.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """An installer for Modoboa."""
 
@@ -87,7 +87,7 @@ def main(input_args):
     config.set("general", "domain", args.domain)
     config.set("dovecot", "domain", args.domain)
     config.set("modoboa", "version", args.version)
-    # Display disclaimer
+    # Display disclaimerpython 3 linux distribution
     if not args.upgrade:
         installation_disclaimer(args, config)
     else: