README:19 says `bundle up`, but Bundler has no `up` subcommand

[morphqdd]

What happens

In README.md, the "How to use" section instructs new contributors to install dependencies with:

Make sure you have [Ruby](https://www.ruby-lang.org/) 3.4+ and
[Bundler](https://bundler.io/) installed. Then:

bundle up
bundle exec rake

There is no bundle up subcommand. Running it produces Could not find command "up" and Bundler exits non-zero. The intended command is bundle install (first install) or bundle update (refresh).

A new contributor following the README literally will hit a hard failure on the very first instruction. Since swarm-template is, by name and purpose, the entry point for users creating their first Zerocracy swarm, this defect is hit on minute one of every adoption.

What should happen

Replace bundle up with the intended command:

bundle install
bundle exec rake

Result: the README's quick-start instructions actually work for a fresh checkout.

[morphqdd]

@yegor256, please take a look when you have a moment.

[0crat]

@morphqdd Hey there! 🎉 Nice catch on that bug – you've just earned yourself 18 points as our policy promises! Bug reports like yours are exactly what keeps our codebase solid and our team happy. If you spot anything else that doesn't look quite right, don't hold back – just report it and rack up more points! You're sitting pretty at +601 total, so don't forget to peek at your Zerocracy account to see your progress.