[deploy] fix path to flow-parser's package.json in deploy script
[deploy] fix path to flow-parser's package.json in deploy script

Summary: forgot to update src/parser/package.json to packages/flow-parser/package.json in the script that deploys flow-parser to npm via travis.

Reviewed By: samwgoldman

Differential Revision: D7295423

fbshipit-source-id: daf078ad831867b6f23025b6b06f497c03e5f3c3

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