Rename perl module to raku.

It doesn't actually contain any Perl config.

init.example.el

@@ -142,13 +142,13 @@
        ;;nix               ; I hereby declare "nix geht mehr!"
        ;;ocaml             ; an objective camel
        org               ; organize your plain life in plain text
-       ;;perl              ; write code no one else can comprehend
        ;;php               ; perl's insecure younger brother
        ;;plantuml          ; diagrams for confusing people more
        ;;purescript        ; javascript, but functional
        ;;python            ; beautiful is better than ugly
        ;;qt                ; the 'cutest' gui framework ever
        ;;racket            ; a DSL for DSLs
+       ;;raku              ; the artist formerly known as perl6
        ;;rest              ; Emacs as a REST client
        ;;rst               ; ReST in peace
        ;;(ruby +rails)     ; 1.step {|i| p "Ruby is #{i.even? ? 'love' : 'life'}"}