Test correct JSON import for updated entries.
Fix JSON import timestamp comparisons.
Merge pull request #273 from toggl/roosmaa-sync-fix

Fix broken sync. Closes #272.
Add UpgradeManager. Closes #274.
Merge pull request #275 from toggl/roosmaa-upgrade-hook

Add UpgradeManager. Closes #274.
Change version numbers to 7.0.13.