Update documentation about minimum version of Poetry

docs/dev/01_setup.rst

@@ -7,7 +7,8 @@ by reading its documentation.
 
 Poetry makes a lot of stuff very easy, especially managing a virtual
 environment that contains AlekSIS and everything you need to run the
-framework and selected apps.
+framework and selected apps. The minimum supported version of Poetry
+is 1.2.0.
 
 Also, `Yarn`_ is needed to resolve JavaScript dependencies.