update build deps
the build deps instructions in README.md and CONTRIBUTING.md do not match
i installed only the smaller set in CONTRIBUTING.md - i did not install 'python3-jsonschema' or 'python-pathlib' and had no trouble with the process described in that document, other than the following:
-
./config: line 180: gpg2: command not found
-> changed build dep 'gnupg' to 'gnupg2'
-
Command 'sbuild' not found, but can be installed with:
-> added build dep 'sbuild'