Correct value for CURLOPT_SSL_VERIFYHOST - 2 instead of 1.

From:
https://github.com/tpyo/amazon-s3-php-class/commit/07bb73fe2ad2c74e0d1af395a391ddb8d0fcaa7c
Merge pull request #2 from rasmusbe/master

Wrong value set for CURLOPT_SSL_VERIFYHOST