* Don't use url.Parse for bolt paths: filepaths may not be valid URL-s.
* go.mod: update dependencies
* README.md: add Windows instructions
* pkg/overlay: check for the correct path and text in error
* pkg/overlay: fix tests for windows
* pkg/piecestore: make windows tests pass
* pkg/telemetry: skip test, as it doesn't shutdown nicely
* storage/redis: ensure that redis is clean before running tests
