chore: remove unnecessary error handling

[kilianc]

No description provided.

[github-actions]

Code Coverage Report 7955f2d

Total: 100.0%

Full coverage report

github.com/kilianc/pretender/internal/handlers/osfilereader.go:12:	ReadFile		100.0%
github.com/kilianc/pretender/internal/handlers/pretender.go:44:		NewPretender		100.0%
github.com/kilianc/pretender/internal/handlers/pretender.go:56:		LoadResponsesFile	100.0%
github.com/kilianc/pretender/internal/handlers/pretender.go:97:		getNextResponse		100.0%
github.com/kilianc/pretender/internal/handlers/pretender.go:116:	HandleFunc		100.0%
github.com/kilianc/pretender/pkg/pretender/server.go:21:		NewHTTPHandler		100.0%
github.com/kilianc/pretender/pkg/pretender/server.go:42:		NewServeMux		100.0%
github.com/kilianc/pretender/pkg/pretender/server.go:64:		NewServer		100.0%
total:									(statements)		100.0%