Catch awkward typos

[seanhamlin]

e.g. in the route definition:

          -
            beta.example.com:
              tls-amce: 'false'

[smlx]

We should just check the annotations against a known list using https://github.com/agnivade/levenshtein. Would also need to check against a corpus of existing .lagoon.yml to determine how breaking such a change would be.