Style fix

.travis.yml

@@ -7,7 +7,7 @@ cache:
 matrix:
     fast_finish: true
     include:
-         - php: 7.2
+        - php: 7.2
           env: LARAVEL='5.7.*' TESTBENCH='3.7.*' PHPENUM='1.*' PHPUNIT='7.*' COMPOSER_FLAGS='--prefer-stable'
         - php: 7.3
           env: LARAVEL='5.7.*' TESTBENCH='3.7.*' PHPENUM='1.*' PHPUNIT='7.*' COMPOSER_FLAGS='--prefer-lowest'

src/model/Receipt.php

@@ -301,7 +301,7 @@ class Receipt
     }
 
     /**
-     * Get the value of isUpgraded
+     * Get the value of isUpgraded.
      */
     public function getIsUpgraded()
     {
@@ -309,7 +309,7 @@ class Receipt
     }
 
     /**
-     * Get the value of promotionalOfferId
+     * Get the value of promotionalOfferId.
      */
     public function getPromotionalOfferId()
     {