chore: release 3.4.1

Diff: 3.4.0...3.4.1

Author: darrachequesne

CHANGELOG.md

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+## [3.4.1](https://github.com/socketio/engine.io-client/compare/3.4.0...3.4.1) (2020-04-17)
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+### Bug Fixes
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+* use globalThis polyfill instead of self/global ([357f01d](https://github.com/socketio/engine.io-client/commit/357f01d90448d8565b650377bc7cabb351d991bd))
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