Update filter for python2.

fn.nix

@@ -45,6 +45,7 @@ rec {
   [
     { path = ["meta" "broken"]; msg = (warn "Package ${p.name} is marked as broken." true); check = m: m; }
     { path = ["meta" "knownVulnerabilities" ]; msg = (warn "Package ${p.name} has known Vulnerabilities.." true); check = m: m != []; }
+    { path = ["name"]; msg = (warn "${p.name}: python2 is depricated." false); check = m: (strings.hasInfix "python2" m) || (strings.hasInfix "python-2" m); }
     # not sure if the following test creates false positives (AFAIK every derivation/package needs to have an outPath)
     # , definitely should catch all corner cases/everything that fails to evaluate.
     { path = [ "outPath" ]; msg = (warn "Package ${p.name} has no outPath" true); check = m: !(tryEval m).success; }