fix(deps): update dependency @google-cloud/datastore to v2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
@​google-cloud/datastore	dependencies	major	^1.4.2 -> ^2.0.0	source

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Release Notes

googleapis/nodejs-datastore

v2.0.0

Compare Source

Breaking Changes

• chore: really delete node4 and node9 (#​131)
• fix: drop support for node.js 4.x and 9.x (#​129)

Dependencies

• fix(deps): update dependency google-gax to ^0.20.0 (#​194)
• fix(deps): update dependency google-auth-library to v2 (#​184)
• fix(deps): update dependency google-gax to ^0.19.0 (#​177)
• chore: remove safe-buffer (#​144)
• fix(deps): update dependency google-gax to ^0.18.0 (#​154)
• chore: drop dependency on common (#​148)
• chore: remove propprop (#​145)
• refactor: update nodejs-common and google-auth-library (#​112)

Documentation

• doc: fix namespace causing 404 (#​170)

Internal / Testing Changes

• build: prevent system/sample-test from leaking credentials
• Update CI config (#​201)
• test: remove appveyor config (#​200)
• Update the kokoro config (#​199)
• Enable prefer-const in the eslint config (#​197)
• Enable no-var in eslint (#​196)
• Switch to let/const (#​195)
• Update CI config (#​193)
• Retry npm install in CI (#​191)
• Update CI config (#​185)
• Update CI config (#​182)
• chore(deps): update dependency nyc to v13 (#​181)
• Update the CI config (#​180)
• chore: use arrow functions (#​176)
• chore: make CircleCI config consistent (#​178)
• chore: start converting to es classes (#​173)
• chore(deps): update dependency eslint-config-prettier to v3 (#​169)
• test: use sinon for mocking (#​168)
• chore: do not use npm ci (#​166)
• fix: fix the samples tests (#​164)
• chore: ignore package-lock.json (#​162)
• chore(deps): lock file maintenance (#​160)
• chore: switch back to auto-generated code
• chore(deps): lock file maintenance (#​159)
• chore: use let and const (#​158)
• chore: update renovate config (#​157)
• Delete reference to non-existent sample. (#​149)
• test: throw on deprecation (#​155)
• chore: move mocha options to mocha.opts (#​150)
• Update CI config (#​151)
• chore: add node templates to synth.py (#​143)
• chore: please eslint (#​146)
• chore(deps): lock file maintenance (#​142)
• chore(deps): update dependency eslint-plugin-node to v7 (#​139)
• test: use strictEqual in tests (#​140)
• chore(deps): lock file maintenance (#​138)
• chore(build): use npm ci instead of npm install (#​134)
• chore(deps): lock file maintenance (#​133)
• chore(deps): lock file maintenance (#​132)
• chore(deps): lock file maintenance (#​130)
• chore(deps): lock file maintenance (#​128)
• chore(deps): lock file maintenance (#​127)
• chore(deps): lock file maintenance (#​126)
• chore(deps): lock file maintenance (#​125)
• chore(deps): lock file maintenance (#​124)
• fix(deps): update dependency yargs to v12 (#​122)
• fix(deps): update dependency sinon to v6 (#​120)
• Configure Renovate (#​113)
• Update google-gax dependency (#​119)
• refactor: drop repo-tool as an exec wrapper (#​118)
• chore: update sample lockfiles (#​117)
• fix: update linking for samples (#​115)
• chore(package): update eslint to version 5.0.0 (#​114)
• chore(package): Update sinon to the latest version 🚀 (#​104)

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