Typo in Version class, extra `:`

in latest braintree-php package v6.33.0 it introduced a bug with extra colon `:` in `braintree/braintree_php/lib/Braintree/Version.php`


```
01 <?php
02 
03 namespace Braintree;
04 
05 /**
06  * Braintree Library Version
07  * stores version information about the Braintree library
08  */
09 class Version
10 {
11     const MAJOR = 6;
12     const MINOR = 33;
13     :const TINY = 0;
```