dittto / serverless-s3-assets / 3

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Pull #2

travis-ci

fix: Set S3 version to prevent authorisation failure in eu-central-1 region

Without the `new AWS.S3({ signatureVersion: 'v4' })` the push request failed in Frankfurt region (eu-central-1) as follows
```
Serverless: Failed to get files for "<some file>"
Serverless: Start uploading S3 assets
Serverless: InvalidRequest: The authorization mechanism you have provided is not supported. Please use AWS4-HMAC-SHA256.
```

Failure reason explained in this [stack exchange post](https://craftcms.stackexchange.com/questions/5437/errors-occuring-with-assets-and-amazon-s3).

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