brew uninstal alias for brew uninstall

If `brew instal` is permissible, `brew uninstal` should be, too.

Library/Homebrew/brew.sh

@@ -207,6 +207,7 @@ case "$HOMEBREW_COMMAND" in
   up)          HOMEBREW_COMMAND="update" ;;
   ln)          HOMEBREW_COMMAND="link" ;;
   instal)      HOMEBREW_COMMAND="install" ;; # gem does the same
+  uninstal)    HOMEBREW_COMMAND="uninstall" ;;
   rm)          HOMEBREW_COMMAND="uninstall" ;;
   remove)      HOMEBREW_COMMAND="uninstall" ;;
   configure)   HOMEBREW_COMMAND="diy" ;;

Library/Homebrew/cask/lib/hbc/cli.rb

@@ -37,6 +37,7 @@ module Hbc
       "-S"       => "search",    # verb starting with "-" is questionable
       "up"       => "update",
       "instal"   => "install",   # gem does the same
+      "uninstal" => "uninstall",
       "rm"       => "uninstall",
       "remove"   => "uninstall",
       "abv"      => "info",

Library/Homebrew/global.rb

@@ -69,6 +69,7 @@ HOMEBREW_INTERNAL_COMMAND_ALIASES = {
   "up" => "update",
   "ln" => "link",
   "instal" => "install", # gem does the same
+  "uninstal" => "uninstall",
   "rm" => "uninstall",
   "remove" => "uninstall",
   "configure" => "diy",