some string are inferred as "format":"style"

[IdoWeitzman]

strings which are not "style" are inferred as styles.
for example, given this code:

import toJsonSchema from 'to-json-schema'

const json = {
  'notAStyle': '10:00',
}

console.log(toJsonSchema(json))

the following json schema is generated:
{
"type": "object",
"properties": {
"notAStyle": {
"type": "string",
"format": "style"
}
}
}

I think the regex here can be improved to avoid this mistakes: https://github.com/ruzicka/to-json-schema/blob/master/src/jsonSchemaHelpers.js#L74

I would love to upload PR for this one if possible