chore(deps): update @sentry/browser to v5.20.1

[thi-bot]

This PR contains the following updates:

Package	Update	Type	Change
@sentry/browser	patch	devDependencies	5.20.0 -> 5.20.1

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Release Notes

getsentry/sentry-javascript

v5.20.1

Compare Source

• [react] feat: Add instrumentation for React Router v3 (#​2759)
• [apm/tracing] fix: Make sure fetch requests are being timed correctly (#​2772)
• [apm/tracing] fix: Make sure pageload transactions start timestamps are correctly generated (#​2773)
• [react] ref: Use inline types to avoid redux dependency. (#​2768)
• [core] ref: Expose sentry request for electron (#​2774)
• [node] fix: Set transaction on scope in node for request (#​2769)
• [browser] fix: Make sure that DSN is always passed to report dialog (#​2770)

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