adapt migrations files to flex

migrations/Version20180413135614.php

@@ -2,7 +2,7 @@
 
 namespace Application\Migrations;
 
-use Doctrine\DBAL\Migrations\AbstractMigration;
+use Doctrine\Migrations\AbstractMigration;
 use Doctrine\DBAL\Schema\Schema;
 
 /**
@@ -13,7 +13,7 @@ class Version20180413135614 extends AbstractMigration
     /**
      * @param Schema $schema
      */
-    public function up(Schema $schema)
+    public function up(Schema $schema): void
     {
         $this->abortIf($this->connection->getDatabasePlatform()->getName() !== 'postgresql', 'Migration can only be executed safely on \'postgresql\'.');
 
@@ -33,7 +33,7 @@ class Version20180413135614 extends AbstractMigration
     /**
      * @param Schema $schema
      */
-    public function down(Schema $schema)
+    public function down(Schema $schema): void
     {
         $this->abortIf($this->connection->getDatabasePlatform()->getName() !== 'postgresql', 'Migration can only be executed safely on \'postgresql\'.');
 

migrations/Version20180413201023.php

@@ -2,7 +2,7 @@
 
 namespace Application\Migrations;
 
-use Doctrine\DBAL\Migrations\AbstractMigration;
+use Doctrine\Migrations\AbstractMigration;
 use Doctrine\DBAL\Schema\Schema;
 
 /**
@@ -13,7 +13,7 @@ class Version20180413201023 extends AbstractMigration
     /**
      * @param Schema $schema
      */
-    public function up(Schema $schema)
+    public function up(Schema $schema): void
     {
         $this->abortIf($this->connection->getDatabasePlatform()->getName() !== 'postgresql', 'Migration can only be executed safely on \'postgresql\'.');
 
@@ -36,7 +36,7 @@ class Version20180413201023 extends AbstractMigration
     /**
      * @param Schema $schema
      */
-    public function down(Schema $schema)
+    public function down(Schema $schema): void
     {
         $this->abortIf($this->connection->getDatabasePlatform()->getName() !== 'postgresql', 'Migration can only be executed safely on \'postgresql\'.');
 

migrations/Version20180426093011.php

@@ -2,7 +2,7 @@
 
 namespace Application\Migrations;
 
-use Doctrine\DBAL\Migrations\AbstractMigration;
+use Doctrine\Migrations\AbstractMigration;
 use Doctrine\DBAL\Schema\Schema;
 
 /**
@@ -10,7 +10,7 @@ use Doctrine\DBAL\Schema\Schema;
  */
 class Version20180426093011 extends AbstractMigration
 {
-    public function up(Schema $schema)
+    public function up(Schema $schema): void
     {
         $this->abortIf($this->connection->getDatabasePlatform()->getName() !== 'postgresql', 'Migration can only be executed safely on \'postgresql\'.');
 
@@ -18,7 +18,7 @@ class Version20180426093011 extends AbstractMigration
         $this->addSql('ALTER TABLE chill_task.recurring_task ADD closed BOOLEAN DEFAULT \'false\' NOT NULL');
     }
 
-    public function down(Schema $schema)
+    public function down(Schema $schema): void
     {
         $this->abortIf($this->connection->getDatabasePlatform()->getName() !== 'postgresql', 'Migration can only be executed safely on \'postgresql\'.');
 

migrations/Version20180502194119.php

@@ -2,7 +2,7 @@
 
 namespace Application\Migrations;
 
-use Doctrine\DBAL\Migrations\AbstractMigration;
+use Doctrine\Migrations\AbstractMigration;
 use Doctrine\DBAL\Schema\Schema;
 
 /**
@@ -10,7 +10,7 @@ use Doctrine\DBAL\Schema\Schema;
  */
 class Version20180502194119 extends AbstractMigration
 {
-    public function up(Schema $schema)
+    public function up(Schema $schema): void
     {
         $this->abortIf($this->connection->getDatabasePlatform()->getName() !== 'postgresql', 'Migration can only be executed safely on \'postgresql\'.');
 
@@ -23,7 +23,7 @@ class Version20180502194119 extends AbstractMigration
         $this->addSql('ALTER TABLE chill_task.single_task_place_event ADD CONSTRAINT FK_D459EBEE8DB60186 FOREIGN KEY (task_id) REFERENCES chill_task.single_task (id) NOT DEFERRABLE INITIALLY IMMEDIATE');
     }
 
-    public function down(Schema $schema)
+    public function down(Schema $schema): void
     {
         $this->abortIf($this->connection->getDatabasePlatform()->getName() !== 'postgresql', 'Migration can only be executed safely on \'postgresql\'.');