[Snyk] Upgrade ts-node from 8.1.0 to 8.4.1

[snyk-bot]

Snyk has created this PR to upgrade ts-node from 8.1.0 to 8.4.1.

• The recommended version is 5 versions ahead of your current version.
• The recommended version was released a month ago, on 2019-09-16.

Release notes

• Package name: ts-node
  • 8.4.1 - 2019-09-16

    Fixed

    • Revert "List all files in memory cache improves perf 1.4x" 87a6e2c
  • 8.4.0 - 2019-09-15

    Added

    • Introduce transformers program support (#879) 12ff53d

    Fixed

    • Fix prefer TS exts via env variables (#867) b01b629
  • 8.3.0 - 2019-06-15

    Added

    • Support --prefer-ts-exts flag
  • 8.2.0 - 2019-05-26

    Added

    • Expand FS cache to all file system operations

    Changed

    • Pass all files to "root scripts" TypeScript compiler option to improve performance
  • 8.1.1 - 2019-05-25

    Fixed

    • Remove realpath from TypeScript compiler to support existing use-cases without preserveSymlinks
  • 8.1.0 - 2019-04-15

    Added

    • Expose --log-error option for logging on TypeScript compilation issues
    • Cache file system lookup operations

    Changed

    • Remove incremental and tsBuildInfoFile compiler options
from [`ts-node` GitHub Release Notes](https://github.com/TypeStrong/ts-node/releases)

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