Bump Node version in travis and fix integration test #281
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.travis.ymlto the LTS versions support in AWS Lambda (10 and 12)The integration test failure is caused by a change in Node's behavior after version 10. Requests with a body and
content-lengthheader value < 0 used to throw an exception, caught by our library and handled by returning a 502 error. In the latest releases of Node these requests don't fail anymore and instead reach Express that returns a 400.I have disabled the integration test since the model of the 502 response is still checked by our unit tests. We will need to find a different way to cause Node/Express to throw an exception to validate the behavior in integration tests.
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