Update README.md

Author: resmo

README.md

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+# !!! NOTE !!!
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+This collection is in maintance mode: bug fixes only. For new features, please visit https://github.com/vultr/ansible-collection-vultr/.
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+----
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 ![Collection integration](https://github.com/ngine-io/ansible-collection-vultr/workflows/Collection%20integration/badge.svg)
  [![Codecov](https://img.shields.io/codecov/c/github/ngine-io/ansible-collection-vultr)](https://codecov.io/gh/ngine-io/ansible-collection-vultr)
 [![License](https://img.shields.io/badge/license-GPL%20v3.0-brightgreen.svg)](LICENSE)