fix: Install integrations when SDK is enabled

[kamilogorek]

No description provided.

[getsentry-bot]

	Fails
🚫	TSLint failed: @sentry/browser ERROR: /home/travis/build/getsentry/sentry-javascript/packages/browser/test/unit/index.test.ts[210, 20]: Explicit type parameter needs to be provided to the function call ERROR: /home/travis/build/getsentry/sentry-javascript/packages/browser/test/unit/index.test.ts[220, 21]: Explicit type parameter needs to be provided to the function call
🚫	TSLint failed: @sentry/core ERROR: /home/travis/build/getsentry/sentry-javascript/packages/core/test/lib/sdk.test.ts[98, 9]: The key 'defaultIntegrations' is not sorted alphabetically
🚫	TSLint failed: @sentry/node ERROR: /home/travis/build/getsentry/sentry-javascript/packages/node/test/handlers.test.ts[8, 5]: The key 'headers' is not sorted alphabetically ERROR: /home/travis/build/getsentry/sentry-javascript/packages/node/test/handlers.test.ts[16, 7]: The key 'email' is not sorted alphabetically ERROR: /home/travis/build/getsentry/sentry-javascript/packages/node/test/handlers.test.ts[2, 1]: Import sources within a group must be alphabetized.

	Warnings
⚠️	Please add a changelog entry for your changes.

	Messages
📖	@sentry/browser bundle gzip'ed minified size: (ES5: 16.0908 kB) (ES6: 15.29 kB)

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