Parser gets stuck in infinite loop if final line doesn't contain \n

[Mathew Button]

Hi there,

Firstly thank you for making this gem, I've been playing around with a recipe tool at home and stumbled across cooklang and your parser.

I noticed that if the recipe was missing a new line character at the end of the final line it would hang.

CooklangRb::Recipe.new("A very short recipe")
=> *hangs*

vs

CooklangRb::Recipe.new("A very short recipe\n")
#<CooklangRb::Recipe:0x0000000111c0cb70 @buffer=#<StringScanner fin>, @metadata={}, @source="A very short recipe\n", @steps=[[{"type"=>"text", "value"=>"A very short recipe"}]]>

I've got a branch that I believe fixes the issue (although no particularly elegantly). Would you consider a PR with this fix?

[Drew Bragg]

Hey @mathewdbutton, thanks for the bug report! Def feel free to open a PR to fix this, I'd love to take a look