Use secure protocol when running `bundle install`
Use secure protocol when running `bundle install`

This PR suppresses the following warnings.

```console
% bundle install
The git source `git://github.com/cucumber/cucumber-ruby-core.git` uses
the `git` protocol, which transmits data without encryption. Disable
this warning with `bundle config git.allow_insecure true`, or switch to
the `https` protocol to keep your data secure.
The git source `git://github.com/cucumber/cucumber-ruby-wire.git` uses
the `git` protocol, which transmits data without encryption. Disable
this warning with `bundle config git.allow_insecure true`, or switch to
the `https` protocol to keep your data secure.
Fetching git://github.com/cucumber/cucumber-ruby-core.git
Fetching git://github.com/cucumber/cucumber-ruby-wire.Git
```

Refer: bundler/bundler#4127

cucumber/cucumber-ruby,cucumber/cucumber-ruby,cucumber/cucumber-ruby