Update README to use v2.1.0

Disable signing for now

Set project version to v2.0.0

Update README.md with freerouting-1.9.0.jar executable

Update version numbers in README

Update filenames to release v1.7.0

Update metadata.json

Change version to 1.6.2

Change version number to 1.6.1

Change version number to 1.6.0