chore(deps): Update dependency decaffeinate to version .x 🌟

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
decaffeinate	devDependencies	major	4.8.8 -> 5.1.12	source

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Release Notes

decaffeinate/decaffeinate

v5.1.12

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Bug Fixes

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

v5.1.11

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Bug Fixes

• ensure assignment patterns have declarations as expected (731c0df)

v5.1.10

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Bug Fixes

• ensure export { default } from './source' works (9a37955), closes #​1367

v5.1.9

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Bug Fixes

• insert missing separators between module specifiers (fd502f6), closes #​1365

v5.1.8

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Bug Fixes

• ensure imports without specifiers work (541787b), closes decaffeinate/decaffeinate-parser#​411

v5.1.7

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Bug Fixes

• package: update decaffeinate-coffeescript2 to version 2.2.1-patch.5 (09bea9e)

v5.1.6

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Bug Fixes

• package: update decaffeinate-coffeescript to version 1.12.7-patch.3 (f5e68f7)

v5.1.5

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Bug Fixes

• package: update dependencies (9d08960)

v5.1.4

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Bug Fixes

• package: update coffee-lex to fix a shorthand this issue (19fdce1), closes decaffeinate/coffee-lex#​175

v5.1.3

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Bug Fixes

• use decaffeinate-parser's coffee-lex version (1d59af5)

v5.1.2

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Bug Fixes

• update a bunch of dependencies (363659c)

v5.1.1

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Bug Fixes

• package: update add-variable-declarations to version 4.0.0 (bca6c36)

v5.1.0

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Features

• add support for babel v7 (7e841e8)

v5.0.1

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Bug Fixes

• upgrade to TypeScript 3.x and make dependencies work (263136f)

v5.0.0

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Bug Fixes

• disable optional chaining (b6e205c), closes #​1281

BREAKING CHANGES

• Since the spec has changed in ways that diverge from what CoffeeScript allowed, mapping soaked expressions to optional chaining makes less sense than in once did.

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