Updated thrift version. #47

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gareth-robinson:thriftVersion

Commits on Jan 10, 2019

Updated thrift version. Older version had 'nodeunit' as a dependency (not devDependency), meaning that a lot of test libraries ended up bloating production builds using this library
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Latest version of thrift uses a version of 'ws' that needs Buffer.alloc, only introduced in node 5.10. Updated the travis and package engines to start testing from v6
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