Parse multiple lines

[finnp]

Right now it only checks the first lines, this should check all provided lines. It should be graceful with the last line though, since it might be cut-off.

[finnp]

For reference, this is @Karissa implementation: https://github.com/karissa/detect-format/blob/1d22e68aa7385e09fee1b4454c34512e6cea7059/index.js