[14.4] Fix the Create method for Environments (#648)

Author: xewl

src/Api/Environments.php

@@ -54,7 +54,7 @@ public function create($project_id, array $parameters = [])
         $resolver->setDefined('external_url')
             ->setAllowedTypes('external_url', 'string');
 
-        return $this->post($this->getProjectPath($project_id, 'environment'), $resolver->resolve($parameters));
+        return $this->post($this->getProjectPath($project_id, 'environments'), $resolver->resolve($parameters));
     }
 
     /**

tests/Api/EnvironmentsTest.php

@@ -166,7 +166,7 @@ public function shouldCreateEnvironment(): void
         $api = $this->getApiMock();
         $api->expects($this->once())
             ->method('post')
-            ->with('projects/1/environment', $params)
+            ->with('projects/1/environments', $params)
             ->will($this->returnValue($expectedArray));
 
         $this->assertEquals($expectedArray, $api->create(1, $params));