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Pull #447

travis-ci

fix memory leak

For many reasons, node caches and leaves in memory (for pretty lengthy amount of time) HTTPRequest instances. Form-data doesn't unsubscribe from 'error' and 'response' event, leaving references to finish / callback. This is kind-of okay in most cases (HTTPRequest's do die after a while), it might be a problem with large payloads or other memory-hungry situations.
This was only tested with NodeJS 8 - future versions might change how they are working with HTTPRequest's objects.

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