fix(deps): update dependency which to v1.3.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
which	1.2.4 -> 1.3.1

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Release Notes

npm/node-which

v1.3.1

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• update deps
• update travis

v1.3.0

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• Add nothrow option to which.sync
• update tap

v1.2.14

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• appveyor: drop node 5 and 0.x
• travis-ci: add node 6, drop 0.x

v1.2.13

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• test: Pass missing option to pass on windows
• update tap
• update isexe to 2.0.0
• neveragain.tech pledge request

v1.2.12

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• Removed unused require

v1.2.11

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• Prevent changelog script from being included in package

v1.2.10

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• Use env.PATH only, not env.Path

v1.2.9

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• fix for paths starting with ../
• Remove unused is-absolute module

v1.2.8

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• bullet items in changelog that contain (but don't start with) #

v1.2.7

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• strip 'update changelog' changelog entries out of changelog

v1.2.6

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• make the changelog bulleted

v1.2.5

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• make a changelog, and keep it up to date
• don't include tests in package
• Properly handle relative-path executables
• appveyor
• Attach error code to Not Found error
• Make tests pass on Windows

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