Add support non global instalation

[MaxmaxmaximusAWS]

Add support non global instalation.

npm i @lifeomic/json-schema-to-graphql-types

package.json

{
  "scripts": {
    "convert": "convert-json-schemas-to-graphql-types src/graphql/"
  }
}

[mdlavin]

Thanks for your suggestion. Does something need to change to support that?

[MaxmaxmaximusAWS]

npm run convert

Error: convert-json-schemas-to-graphql-types file not exists