Break with new elm.json file

[ghivert]

Hi !

When using evancz/url-parser, grove break at installation. Here's the error:

Checking out: evancz/url-parser (2.0.1)
ERROR: Unable to read: elm-package.json location: /var/folders/29/t_wnc0p501vg6whgqdmwhnmc0000gn/T/evancz/url-parser/elm-package.json Error: SystemError NoSuchFileOrDirectory { message = "ENOENT: no such file or directory, open '/var/folders/29/t_wnc0p501vg6whgqdmwhnmc0000gn/T/evancz/url-parser/elm-package.json'", stack = "Error: ENOENT: no such file or directory, open '/var/folders/29/t_wnc0p501vg6whgqdmwhnmc0000gn/T/evancz/url-parser/elm-package.json'", syscall = "open", path = Just "/var/folders/29/t_wnc0p501vg6whgqdmwhnmc0000gn/T/evancz/url-parser/elm-package.json", address = Nothing, port_ = Nothing }

It probably is because the new url-parser package uses the new syntax with elm-package.json to elm.json.
I think it would be great to fix it! 😉