chore(package): update svelte to version 2.6.6
chore(package): update svelte to version 2.6.6

PR-URL: https://github.com/johnmuhl/electron-crash-report-server/pull/165
Closes: https://github.com/johnmuhl/electron-crash-report-server/pull/131
johnmuhl/electron-crash-report-server,johnmuhl/electron-crash-report-server