chore(deps-dev): update decaffeinate requirement from ^3.0.0 to ^5.1.12

[dependabot-preview]

Updates the requirements on decaffeinate to permit the latest version.

Release notes

Sourced from decaffeinate's releases.

v5.1.12

5.1.12 (2019-02-14)

Bug Fixes

• ensure import/export sources are not template literals (2decc8a)

Commits

• 2decc8a fix: ensure import/export sources are not template literals
• 731c0df fix: ensure assignment patterns have declarations as expected
• 9a37955 fix: ensure export { default } from './source' works
• fd502f6 fix: insert missing separators between module specifiers
• 541787b fix: ensure imports without specifiers work
• 7c7bd69 chore(package): update lockfile yarn.lock
• 09bea9e fix(package): update decaffeinate-coffeescript2 to version 2.2.1-patch.5
• 82e78df chore(package): update lockfile yarn.lock
• f5e68f7 fix(package): update decaffeinate-coffeescript to version 1.12.7-patch.3
• 71475df chore(package): update lockfile yarn.lock
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #171.