add possibility to use custom bin-folder for composer

[tomasnorre]

This PR resolves issue #14.

I still haven't tested it fully, as I get some errors when testing locally or with my fork as git repo.

If I run it on my TYPO3 Crawler repository, which has a custom bin-folder, I get the following error.

$ .Build/bin/phpstan-bodyscan

In JsonLoader.php line 20:
                                                                                        
  Could not decode JSON from phpstan: "At least one path must be specified to analyse.  
  "                                                                                     

In JsonLoader.php line 18:
                
  Syntax error  

The repository have a valid phpstan.neon file, so I don't know what I'm overlooking.

I went for the simple implementation and used file_get_content of the composer.json to avoid pulling in an additional dependency.

[TomasVotruba]

Thanks for the PR 👍

I'll merge it, as it solves the custom vendor dir issue 💪

The follow up issue is probably this one: #11
We'll need a way to pick up paths from phpstan.neon instead of the hardcoded ones

[tomasnorre]

You're right, looks like that issue. I can confirm it by adding my Classes directly to https://github.com/TomasVotruba/phpstan-bodyscan/blob/main/src/Process/AnalyseProcessFactory.php#L20.

Thanks for merging it.

[Hackwar]

Thanks for taking this up.