message: Typo fix in CLI for GoogleAction
  "SKD" -> "SDK"
diff: @@ -284,11 +284,11 @@ module.exports = {
  exec('gcloud -v', function(error, stdout, stderr ) {
  if (error) {
  if (stderr) {
  - return reject(new Error('Your Google Cloud SKD isn\'t installed properly'));
  + return reject(new Error('Your Google Cloud SDK isn\'t installed properly'));
  }
  }
  if (!_.startsWith(stdout, 'Google Cloud SDK')) {
  - return reject(new Error('Your Google Cloud SKD isn\'t installed properly'));
  + return reject(new Error('Your Google Cloud SDK isn\'t installed properly'));
  }
  resolve(stdout);
  