Docker image: "Error: Cannot find module '../../package.json'"

Hello!

I can't get the Docker image to work.

Am I doing something wrong here, or is the Docker image broken?

```sh
~ $ docker run -it 'lxlu/openapi-cop:v1.3.2'
internal/modules/cjs/loader.js:638
throw err;
^

Error: Cannot find module '../../package.json'
at Function.Module._resolveFilename (internal/modules/cjs/loader.js:636:15)
at Function.Module._load (internal/modules/cjs/loader.js:562:25)
at Module.require (internal/modules/cjs/loader.js:692:17)
at require (internal/modules/cjs/helpers.js:25:18)
at Object. (/openapi-cop-docker/src/cli.js:13:20)
at Module._compile (internal/modules/cjs/loader.js:778:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
at Module.load (internal/modules/cjs/loader.js:653:32)
at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
at Function.Module._load (internal/modules/cjs/loader.js:585:3)
~ [1]$
```