Add completion for Git submodule moving and removing

modules/git/functions/_git-submodule-remove

@@ -0,0 +1,27 @@
+#compdef git-submodule-remove
+#autoload
+
+#
+# Completes git-submodule-remove.
+#
+# Authors:
+#   Sorin Ionescu <sorin.ionescu@gmail.com>
+#
+
+if ! is-true "$(git rev-parse --is-inside-work-tree 2> /dev/null)"; then
+  return 1
+fi
+
+local -a submodules
+local submodule
+
+while IFS=$'\n' read submodule; do
+  submodules+=("$submodule")
+done < <(
+  git config --file "$(git-root)/.gitmodules" --list \
+    | grep '.path=' \
+    | cut -d= -f2-
+)
+
+_describe -t submodule 'submodules' submodules && return 0
+