[PSR] Fixed library source

- Using `php-cs-fixer` tool.

lib/PayPal/Converter/FormatConverter.php

@@ -53,7 +53,7 @@ class FormatConverter
                 throw new \InvalidArgumentException("value cannot have decimals for $currency currency");
             }
             $decimals = $currencyDecimals[$currency];
-        } else if (strpos($value, ".") === false) {
+        } elseif (strpos($value, ".") === false) {
             // Check if value has decimal values. If not no need to assign 2 decimals with .00 at the end
             $decimals = 0;
         }