Added spatie crawler library, downgraded guzzlehttp/psr7 version. Improved SnippetSniffer

Author: evens-stone

composer.json

@@ -34,10 +34,11 @@
     },
     "require": {
         "php": "^7.3.0",
+        "guzzlehttp/psr7": "^1.4",
         "fabpot/goutte": "^4.0@dev",
-        "guzzlehttp/psr7": "^2.0@dev",
         "monolog/monolog": "^2.0@dev",
-        "snippetify/programming-languages": "dev-master"
+        "snippetify/programming-languages": "dev-master",
+        "spatie/crawler": "dev-master"
     },
     "require-dev": {
         "phpunit/phpunit": "^9.0"