Update README.md

[CharlesCNorton]

• Automated encoding detection bullet:

  • “that make sense” ➜ “that makes sense” (singular noun → singular verb)

• Section heading:

  • “## Licencing” ➜ “## Licensing” (standard spelling)

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[a3957273]

Hey @CharlesCNorton, we would happily accept the fix to the typo in the 'automated encoding' section, but will likely keep the UK spelling of 'Licence' given this is a UK government project.

[a3957273]

Also, please could you sign the CLA!