Update dependency firebase to v4

[renovate-tests]

This Pull Request updates dependency firebase from v3.9.0 to v4.2.0

Commits

firebase/firebase-js-sdk

4.2.0

• 4b6936a fix(ie11): add Array.prototype.find/findIndex polyfills (#​115)
• c58719c feat(auth): Adds support to specifying Auth state persistence. (#​105)
• bc1f67c style(*): Automate Code Formatting (#​90)
• d9e0ce9 fix(database): Adding toJSON() method to TransactionResult (#​104)

4.1.5

• 1c300d9 chore(publish): 4.1.5 (#​108)
• 8553caa fix(database): fix issue with base64Decode (#​107)
• c8dfea3 fix(*): Fix compilation problems in my local environment (#​98)
• 2f989fb chore(publish): 4.1.4 (#​96)

4.1.4

• bcd13ad refactor(build): Refactor build process to generate smaller bundles
• 00f9c37 refactor(database): Add types to several classes and utility methods (#​66)
• 58fc4c9 fix(externs): fix window var provided extern (#​93)
• 36f81f8 chore(*): add license headers (#​92)
• e67c9bf Update CODEOWNERS
• 6b08de1 Update CODEOWNERS
• a2c04b8 feat(*): add CODEOWNERS file to .github (#​91)
• a8919cd refactor(database): Implement database in Typescript (#​72)
• 6aaef70 fix(core): improve typings with new Observer interface (#​56)
• 9a6f0db fix(messaging): Add check for Fetch API support (#​79)
• 657055d chore(publish): 4.1.3 (#​68)

4.1.3

• 109cbb3 fix(app): Allow Object.prototype member names as app names (#​70)
• 5f2ca5a fix(auth): fix redirect invalid caching issue (#​67)
• 13ff80a chore(.gitignore): Add '.idea' folder for JetBrains IDEs (#​64)
• 7d88c38 Add @override annotation to Promise methods that override Thenable's. (#​57)
• 26d3e4f Update README.md (#​58)
• bc94aae fix(auth): fix typings and externs for PhoneAuthProvider.credential (#​50)
• ec19fc5 fix(storage): allow missing some methods in UploadTask observer (#​41)
• 2801c34 chore(package.json): 4.1.2 (#​30)

4.1.2

• 45624b4 fix(core): utilize "webpackJsonpFirebase" for Webpack JSONP output func (#​43)
• cb46f75 fix(app): fix issue with FirebaseApp extending INTERNAL (#​38)
• 8a90518 docs(*): add per-feature supported environment info. (#​33)
• 4a96189 fix(sourcemaps): fix sourcemap generation for browser code triage-skip
• f70c7f2 fix(travis.yml): pin Node.js version to 6 (#​28)
• 395d261 chore(package.json): 4.1.1 (#​27)

4.1.1

• 01e9535 fix(app): fix issue with default instanceIdentifier (#​26)
• 0766643 chore(publish): 4.1.0 (#​25)

4.1.0

• 9d74436 Update ISSUE_TEMPLATE.md triage-skip
• 85ec114 fix(auth): fix Safari iFrame loop issue (#​24)
• bd24f71 feat(app): Allow for lazy registration of app components (#​15)
• 706bdbb fix(docs): CONTRIBUTING link in README (#​16)
• 3a4c314 refactor(package.json): Fix external license reference (#​12)
• 241470c feat(travis-ci): add .travis.yml triage-skip
• 822a02c docs(README): Fix listed CDN version (#​10)

4.0.0

• c054dab fix(auth): fix race condition in anonymous sign in triage-skip
• a9a678b fix(gulp): fix path to unit tests for "gulp test" task triage-skip
• 9e7a5c0 fix(gulp): fix the gulp task "test:unit:node" (#​5)
• fd07281 feat(*): initial open source push (#​2)

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