improved code styles #158 (#172)

* use php-cs-fixer instead of phpcodesniffer
* updated scrutinizer config
* adjusted code yules to all files
* updated CONTRIBUTING guidelines

src/Entity/UserPreference.php

@@ -21,8 +21,8 @@ use Symfony\Component\Validator\Constraints as Assert;
  */
 class UserPreference
 {
-    const HOURLY_RATE = 'hourly_rate';
-    const SKIN = 'skin';
+    public const HOURLY_RATE = 'hourly_rate';
+    public const SKIN = 'skin';
 
     /**
      * @var int
@@ -82,6 +82,7 @@ class UserPreference
     public function setId(int $id): UserPreference
     {
         $this->id = $id;
+
         return $this;
     }
 
@@ -100,6 +101,7 @@ class UserPreference
     public function setUser(User $user): UserPreference
     {
         $this->user = $user;
+
         return $this;
     }
 
@@ -118,6 +120,7 @@ class UserPreference
     public function setName(string $name): UserPreference
     {
         $this->name = $name;
+
         return $this;
     }
 
@@ -143,6 +146,7 @@ class UserPreference
     public function setValue($value): UserPreference
     {
         $this->value = $value;
+
         return $this;
     }
 
@@ -155,6 +159,7 @@ class UserPreference
     public function setType(string $type)
     {
         $this->type = $type;
+
         return $this;
     }
 
@@ -175,6 +180,7 @@ class UserPreference
     public function setConstraints(array $constraints)
     {
         $this->constraints = $constraints;
+
         return $this;
     }
 
@@ -187,6 +193,7 @@ class UserPreference
     public function addConstraint(Constraint $constraint)
     {
         $this->constraints[] = $constraint;
+
         return $this;
     }