Handle elm-make writing multiple lines of JSON
Handle elm-make writing multiple lines of JSON

When using --format json, elm-make may write multiple JSON arrays
to stdout, separated by newlines.  In this case, the output must be
split on each newline, and the contents of each line must be parsed
individually as JSON arrays.

sbrink/vscode-elm,Krzysztof-Cieslak/vscode-elm