fix: filesystem cache handler with url params

[mjastrzebowski]

Server crashes whenever trying to cache with FileSystemCacheHandler some route with url params, eg. /search?term=test or /category/example?page=4 - might be problem on Windows only as mentioned in #38 that you can't create file with special characters, but IMO in general it would be good to have more safe filenames.

Basically replacing all special characters from route is fixing the main problem, in the future I will also take a look into angular prerendering itself (also breaks on special characters right now) and might need some changes to convertFileNameToRoute method as well.

Solves #38

[vercel]

Someone is attempting to deploy a commit to a Personal Account owned by @eneajaho on Vercel.

@eneajaho first needs to authorize it.