StyleCI fixes

Fixing the issues reported in <https://github.styleci.io/analyses/z3k5EY>.

Author: scy

src/Issue/Worklog.php

@@ -89,6 +89,7 @@ public function setComment($comment)
 
     // Note that in the docblock below, you cannot replace `mixed` by `\DateTimeInterface|string` because JsonMapper doesn't support that,
     // see <https://github.com/cweiske/jsonmapper/issues/64#issuecomment-269545585>.
+
     /**
      * Function to set start time of worklog.
      *

src/JiraClient.php

@@ -82,7 +82,7 @@ public function __construct(ConfigurationInterface $configuration = null, Logger
         $this->json_mapper->undefinedPropertyHandler = [new \JiraRestApi\JsonMapperHelper(), 'setUndefinedProperty'];
 
         // Properties that are annotated with `@var \DateTimeInterface` should result in \DateTime objects being created.
-        $this->json_mapper->classMap['\\' . \DateTimeInterface::class] = \DateTime::class;
+        $this->json_mapper->classMap['\\'.\DateTimeInterface::class] = \DateTime::class;
 
         // create logger
         if ($logger) {

tests/AssigneeTest.php

@@ -15,7 +15,7 @@ public function setUp()
     {
         $this->mapper = new JsonMapper();
         $this->mapper->undefinedPropertyHandler = [new \JiraRestApi\JsonMapperHelper(), 'setUndefinedProperty'];
-        $this->mapper->classMap['\\' . \DateTimeInterface::class] = \DateTime::class;
+        $this->mapper->classMap['\\'.\DateTimeInterface::class] = \DateTime::class;
     }
 
     public function tearDown()

tests/MapperTest.php

@@ -17,7 +17,7 @@ public function setUp()
     {
         $this->mapper = new JsonMapper();
         $this->mapper->undefinedPropertyHandler = [new \JiraRestApi\JsonMapperHelper(), 'setUndefinedProperty'];
-        $this->mapper->classMap['\\' . \DateTimeInterface::class] = \DateTime::class;
+        $this->mapper->classMap['\\'.\DateTimeInterface::class] = \DateTime::class;
     }
 
     public function tearDown()