tap_migrations.json: remove homebrew/php references.

tap_migrations.json

@@ -14,7 +14,6 @@
   "corelocationcli": "caskroom/cask",
   "dart": "dart-lang/dart",
   "dbt": "fishtown-analytics/dbt",
-  "drush": "homebrew/php",
   "dwarf-fortress": "caskroom/cask",
   "geany": "caskroom/cask",
   "gimp": "caskroom/cask",
@@ -29,7 +28,6 @@
   "keybase": "caskroom/cask",
   "magit": "dunn/emacs",
   "meld": "caskroom/cask",
-  "n98-magerun": "homebrew/php",
   "osxfuse": "caskroom/cask",
   "pdf-tools": "dunn/emacs",
   "pebble-sdk": "pebble/pebble-sdk",