Update rustic recipe - switch to supported repository (#2967)

Author: alexott

recipes/rustic.rcp

@@ -1,6 +1,7 @@
 (:name rustic
        :description "Rust development environment for Emacs"
        :type github
-       :pkgname "brotzeit/rustic"
+       :pkgname "emacs-rustic/rustic"
        :minimum-emacs-version "26.1"
-       :depends (rust-mode dash f let-alist markdown-mode project s seq spinner xterm-color))
+       :depends (rust-mode dash f let-alist markdown-mode project s seq
+                           spinner xterm-color flycheck))