rename Resolvers to Resolver

refs #11

Author: Balint Kovacs

README.md

@@ -164,7 +164,7 @@ $issues = $taiga->issues()->create(['project' => $projectId, 'subject' => 'My su
 - Issue Types
 - Priorities
 - Projects
-- Resolvers
+- Resolver
 - Severities
 - Users
 - UserStories

src/Services/Resolvers.php src/Services/Resolver.phpsrc/Services/Resolvers.php renamed to src/Services/Resolver.php

@@ -5,10 +5,10 @@
 use TZK\Taiga\RestClient;
 use TZK\Taiga\Service;
 
-class Resolvers extends Service
+class Resolver extends Service
 {
     public function __construct(RestClient $taiga)
     {
-        parent::__construct($taiga, 'resolvers');
+        parent::__construct($taiga, 'resolver');
     }
 }