primeobsession / opengraph-io / 18 / 1

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Pull #1

travis-ci

Return rejected promise

Just throwing the error causes the following error in at least node `v8.1.4`:
```
(node:15749) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): StatusCodeError: 500 - {"error":"Testing error"}
(node:15749) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
```
even if you are catching the results of `getSiteInfo`.  Returning the rejected promise fixes that error while still allowing code that calls `getSiteInfo` to `.catch()` its results properly.

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