Fix code style issues

Author: jaapio

src/TypeResolver.php

@@ -223,7 +223,7 @@ private function parseTypes(ArrayIterator $tokens, Context $context, int $parser
 
                 $classType = array_pop($types);
                 if ($classType !== null) {
-                    if ((string)$classType === 'class-string') {
+                    if ((string) $classType === 'class-string') {
                         $types[] = $this->resolveClassString($tokens, $context);
                     } else {
                         $types[] = $this->resolveCollection($tokens, $classType, $context);

src/Types/ClassString.php

@@ -47,8 +47,8 @@ public function __toString() : string
     {
         if ($this->fqsen === null) {
             return 'class-string';
-        } else {
-            return 'class-string<' . (string)$this->fqsen . '>';
         }
+
+        return 'class-string<' . (string) $this->fqsen . '>';
     }
 }