Fixed issue with unable to open db caches. Solution: don't use disk caches.
Fixed issue with incorrect returned value
Merge branch 'master' of https://github.com/sogko/osm-tags-analysis

* 'master' of https://github.com/sogko/osm-tags-analysis:
  Update README.md
  Update README.md
  Update README.md
  Update README.md
  Create README.md