Directly update binaries and client version to latest version

[pathange-s]

• Instead of having to do : Update the config file option cli.binaryVersion with 4.7.0 and enter neu update to fetch this version. this after every new release, we can have a flag to neu update as neu update --latest to directly update the versions according to the latest available release.
• Updating to latest version is very common, so this would prove to be easy and helpful