Failed to refmt [doesn't work with a lerna monorepo]

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Hi, I'm having a problem regarding the language server. I have a lerna monorepo setup where the `bsconfig.json` is inside a sub project and the dependencies are hoisted at the parent level.

This is the error from `node_modules/.lsp/debug.log`
```
{"jsonrpc":"2.0","id":4,"method":"textDocument/codeAction","params":{"textDocument":{"uri":"file:///Users/razagill/Development/nugen/shared/src/util/general.re"},"range":{"start":{"line":3,"character":0},"end":{"line":3,"character":1}},"context":{"diagnostics":[]}}}
[server] Got a method textDocument/codeAction
[server] processing took 0.0321865081787ms
Sending response {"id": 4, "jsonrpc": "2.0", "error": {"code": -32603, "message": "Failed to refmt '/Users/razagill/Development/nugen/node_modules/bs-platform/lib/refmt.exe' --print binary --recoverable --parse re > '/Users/razagill/Development/nugen/shared/node_modules/.lsp/General-@nugen/shared.ast'\n/bin/sh: /Users/razagill/Development/nugen/shared/node_modules/.lsp/General-@nugen/shared.ast: No such file or directory"}}
```
`version: 1.4.1`
`os: osx mojave 10.14.2`
`node: 11.0.0`
`bs-platform: 4.0.14`

Start with node_modules/.lsp/debug.log and reproduce the textDocument/codeAction request in the reported Lerna layout, with bsconfig.json in the subproject and dependencies hoisted above it. Trace how the refmt command builds its input and output paths. Done means refmt completes for the subproject without the reported missing .ast path error.

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