Error message when pattern name contains invalid characters is confusing

[ivangreene]

The error message that comes out when a pattern name contains a - is confusing and not helpful

Reproducer:
grit.yaml

patterns:
  - name: use-winston
    level: error
    body: |
      `console.log($msg)` => `winston.log($msg)` where {
        $msg <: not within or { `it($_, $_)`, `test($_, $_)`, `describe($_, $_)` }
      }

Run:

$ grit apply use-winston
Your working tree currently has untracked changes and Grit will rewrite files in place. Do you want to proceed? yes
ERROR (code: 299) - Pattern syntax error at 1:1. If you hit this error while running grit apply on a pattern from the Grit standard library, try running grit init. If you are running a custom pattern, check out the docs at https://docs.grit.io/ for help with writing patterns.

[morgante]

Yes, we can definitely improve this. Something like this would be much better:

Pattern use-winston at 2:1 contains invalid character "-".