bash completion: replace deprecated _init_completion

Signed-off-by: Lucio Sauer <watermanpaint@posteo.net>
Closes: #190
Signed-off-by: Arthur Zamarin <arthurzam@gentoo.org>

Author: gonsoos

data/share/bash-completion/completions/pkgdev

@@ -4,7 +4,7 @@ source "/usr/share/bash-completion/helpers/gentoo-common.sh"
 
 _pkgdev() {
     local i=1 cmd cur prev words cword split
-    _init_completion -n : || return
+    _comp_initialize -n : "$@" || return
 
     local subcommands="
         bugs