Update dependencies.

Author: pmatseykanets

composer.json

@@ -21,10 +21,10 @@
     ],
     "require": {
         "php": ">=5.6.4",
-        "illuminate/contracts": "~5.3",
-        "illuminate/database": "~5.3",
-        "illuminate/support": "~5.3",
-        "laravel/scout": "^2.0"
+        "illuminate/contracts": "5.3.*|5.4.*",
+        "illuminate/database": "5.3.*|5.4.*",
+        "illuminate/support": "5.3.*|5.4.*",
+        "laravel/scout": "2.*|3.*"
     },
     "require-dev": {
         "phpunit/phpunit": "^4.8",