remove last twitter remnants

Author: aaronpk

composer.json

@@ -8,7 +8,6 @@
     "mf2/mf2": "^0.4||^0.5",
     "ezyang/htmlpurifier": "^4.10",
     "indieweb/link-rel-parser": "^0.1.0",
-    "dg/twitter-php": "^3.0.0",
     "p3k/timezone": "^0.1.0",
     "p3k/http": "^0.1.0",
     "cebe/markdown": "^1.1.0",
@@ -42,4 +41,4 @@
   "scripts": {
     "test": "vendor/bin/phpunit"
   }
-}
+}

composer.lock

@@ -98,7 +98,6 @@ public function parse(Request $request, Response $response) {
       $fetcher = new p3k\XRay\Fetcher($this->http);
 
       $fields = [
-        'twitter_api_key','twitter_api_secret','twitter_access_token','twitter_access_token_secret',
         'github_access_token',
         'token',
         'accept',