Update README.md fixing grammar

[MeikPiepmeyer]

Fixes wrong grammar in the readme file.

References

nope

Submitter checklist

• [ ] Recommended: Join WireMock Slack to get any help in #help-contributing or a project-specific channel like #wiremock-java
• [x] The PR request is well described and justified, including the body and the references
• [x] The PR title represents the desired changelog entry
• [x] The repository's code style is followed (see the contributing guide)
• [x] Test coverage that demonstrates that the change works as expected
• [x] For new features, there's necessary documentation in this pull request or in a subsequent PR to wiremock.org

[MeikPiepmeyer]

The action "CI / lint-test (pull_request)" fails with

✖︎ wiremock => (version: "0.2.0", path: "charts/wiremock") > Chart version not ok. Needs a version bump!

I the version bump be including in this PR? What are the steps for this?

[gitkent]

The action "CI / lint-test (pull_request)" fails with

✖︎ wiremock => (version: "0.2.0", path: "charts/wiremock") > Chart version not ok. Needs a version bump!

I the version bump be including in this PR? What are the steps for this?

I don't think we need to bump chart version if it is just README change. Can we please update CI to run chart-testing only when files under charts/** is changed/pushed?

Ref: https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions