Added support for Laravel 5.7 (#32)

* Using $guarded instead of $fillable.

* Support for Laravel 5.7.x

* Renamed .codecov.yaml

composer.json

@@ -29,12 +29,7 @@
         }
     ],
     "require": {
-        "illuminate/config": "~5.5.0|~5.6.0",
-        "illuminate/database": "~5.5.0|~5.6.0",
-        "illuminate/contracts": "~5.5.0|~5.6.0",
-        "illuminate/support": "~5.5.0|~5.6.0",
-        "illuminate/http": "~5.5.0|~5.6.0",
-        "illuminate/auth": "~5.5.0|~5.6.0"
+        "laravel/framework": "~5.5.0|~5.6.0|~5.7.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^6.2|^7.0",

src/Models/BlockerModel.php

@@ -7,10 +7,7 @@
 class BlockerModel extends Model
 {
     protected $table = 'blockers';
-    protected $fillable = [
-        'blockable_id', 'blockable_type',
-        'blocker_id', 'blocker_type',
-    ];
+    protected $guarded = [];
 
     public function blockable()
     {

src/Models/FollowerModel.php

@@ -7,10 +7,7 @@
 class FollowerModel extends Model
 {
     protected $table = 'followers';
-    protected $fillable = [
-        'followable_id', 'followable_type',
-        'follower_id', 'follower_type',
-    ];
+    protected $guarded = [];
 
     public function followable()
     {

src/Models/LikerModel.php

@@ -7,10 +7,7 @@
 class LikerModel extends Model
 {
     protected $table = 'likers';
-    protected $fillable = [
-        'likeable_id', 'likeable_type',
-        'liker_id', 'liker_type',
-    ];
+    protected $guarded = [];
 
     public function likeable()
     {