Updated the endpoint to the new one

updated the endpoint to ec2.eu-west-1.amazonaws.com

Signed-off-by: Edwin van Nuil <edwin@vannuil.com>
Merge branch 'master' of github.com:evannuil/aws-snapshot-tool

# By Cameron Manderson
# Via Edwin van Nuil (2) and Cameron Manderson (1)
* 'master' of github.com:evannuil/aws-snapshot-tool:
  Updated reference to snapshots
  Updated the numbering
  Updated the project README to include some helpful notes
  Updated to work with boto SNS latest API