upgrades google auth version

Author: bshaffer

composer.json

@@ -7,7 +7,7 @@
  "license": "Apache-2.0",
  "require": {
  "php": ">=5.4",
- "google/auth": "0.6",
+ "google/auth": "0.7",
  "firebase/php-jwt": "~2.0|~3.0",
  "monolog/monolog": "^1.17",
  "phpseclib/phpseclib": "~2.0",