fix(deps): update dependency @google-cloud/promisify to ^0.4.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
@​google-cloud/promisify	dependencies	minor	^0.3.0 -> ^0.4.0	source

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Release Notes

googleapis/nodejs-promisify

v0.4.0

Compare Source

02-12-2019 19:44 PST

New features

• feat: add callbackify() and callbackifyAll() methods (#​82)

Documentation

• docs: update contributing path in README (#​86)
• chore: move CONTRIBUTING.md to root (#​85)
• docs: add lint/fix example to contributing guide (#​83)

Internal / Testing Changes

• build: create docs test npm scripts (#​88)
• build: test using @​grpc/grpc-js in CI (#​87)
• build: ignore googleapis.com in doc link check (#​81)
• build: check broken links in generated docs (#​79)
• chore(deps): update dependency @​types/sinon to v7 (#​78)
• chore(build): inject yoshi automation key (#​77)
• chore: update nyc and eslint configs (#​76)
• chore: fix publish.sh permission +x (#​74)
• fix(build): fix Kokoro release script (#​73)
• build: add Kokoro configs for autorelease (#​72)
• chore: always nyc report before calling codecov (#​69)
• chore: nyc ignore build/test by default (#​68)
• chore(build): update prettier config (#​66)
• fix: get the build passing (#​65)
• chore: update license file (#​64)
• fix(build): fix system key decryption (#​60)
• chore(deps): update dependency @​types/sinon to v5.0.7 (#​58)
• fix: Pin @​types/sinon to last compatible version (#​57)
• chore: add synth.metadata
• chore(deps): update dependency gts to ^0.9.0 (#​54)
• chore: update eslintignore config (#​53)
• chore: use latest npm on Windows (#​52)
• chore: update CircleCI config (#​51)
• chore: include build in eslintignore (#​48)
• chore: update issue templates (#​44)
• chore: remove old issue template (#​42)
• build: run tests on node11 (#​41)
• chores(build): do not collect sponge.xml from windows builds (#​40)
• chores(build): run codecov on continuous builds (#​39)
• chore: update new issue template (#​38)
• chore(deps): update dependency sinon to v7 (#​33)
• build: fix codecov uploading on Kokoro (#​34)
• Update kokoro config (#​30)
• Update CI config (#​28)
• Don't publish sourcemaps (#​26)
• Update kokoro config (#​24)
• test: remove appveyor config (#​23)
• Update CI config (#​22)
• Enable prefer-const in the eslint config (#​21)
• Enable no-var in eslint (#​19)
• Update CI config (#​18)

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