Function cargo_auto_lib::auto_version_from_date

pub fn auto_version_from_date()

New version from date is written to Cargo.toml and service_worker.js

In Cargo.toml writes the version as the date yyyy.mmdd.HHMM ex. 2019.1221.2359.
For non-library projects, the semver specification is not really useful.
Having the version as the date is just fine for executables and much more human readable.

service_worker.js

Inside the PWA service worker javascript file is also needed to change the version.
The program searches for service_worker.js and modify the version.

no need to change version if no files changed

If src/*.rs or Cargo.toml files are not changed from last compile, than no need to change version.
The dates of the files will be stored in the file .automation_tasks_rs_file_hashes.json near to Cargo.toml.
Warning: I don’t check if the service worker has changed because it rarely does.
To know if the projects has changed or not, this function saves the dates of all files into .automation_tasks_rs_file_hashes.json near Cargo.toml