can't find bs-platform if not installed locally?

Following the instructions for installing [reason](https://reasonml.github.io/docs/en/installation) via npm, it suggests installing bs-platform globally.

After installing this extension for VS Code, I run into ["bs-platform could not be found"](https://github.com/jaredly/reason-language-server/blob/master/src/analyze/BuildSystem.re#L82-L105), so I installed it locally and that resolved the issue.

Start with src/analyze/BuildSystem.re at the linked lines and reproduce the VS Code extension error using the installation instructions in the issue. Trace how bs-platform is located when installed globally versus locally; done means the extension finds the globally installed package without requiring a local installation.

Written by the indexing model from the issue text.