Decrypt with sha256 digest but fallback to md5

Support for PicoLisp 20.6

Install 'network-config' and dont follow symlinks for backup

Replace Travis-CI with GitHub Actions

Update JSON dependency to v4.1.0

Add tests for (decode) and (encode)

Update version to 1.23.1

Fix JSON regression. Remove temporary certs on failure. Fix permissions of certs status file. #22

Update README

Fix broken tests

Update picolisp-semver dependency

Fix tests with new json function names

Update dependencies

Convert line endings with dos2unix. #20

Update JSON dependency to v3.10.0