Extension doesn't work after install

[xfalcox]

Users on Linux and MacOS are reporting that the extension doesn't work after install:

Steps to reproduce

1. Install from marketplace
2. Open Command Palette
3. Pick "Syntax Tree: Start"
4. Get error popup

Linux

Mac

VSCode DevTools shows:

Linux

mainThreadExtensionService.ts:111 Activating extension 'ruby-syntax-tree.vscode-syntax-tree' failed: Cannot find module 'semver/functions/parse'
Require stack:
- /home/user/.vscode/extensions/ruby-syntax-tree.vscode-syntax-tree-0.3.0/node_modules/vscode-languageclient/lib/node/main.js
- /home/user/.vscode/extensions/ruby-syntax-tree.vscode-syntax-tree-0.3.0/node_modules/vscode-languageclient/node.js
- /home/user/.vscode/extensions/ruby-syntax-tree.vscode-syntax-tree-0.3.0/out/extension.js
- /opt/visual-studio-code/resources/app/out/vs/loader.js
- /opt/visual-studio-code/resources/app/out/bootstrap-amd.js
- /opt/visual-studio-code/resources/app/out/bootstrap-fork.js.
$onExtensionActivationError @ mainThreadExtensionService.ts:111

Mac

Activating extension 'ruby-syntax-tree.vscode-syntax-tree' failed: Cannot find module 'semver/functions/parse'
Require stack:
- /Users/user/.vscode/extensions/ruby-syntax-tree.vscode-syntax-tree-0.3.0/node_modules/vscode-languageclient/lib/node/main.js
- /Users/user/.vscode/extensions/ruby-syntax-tree.vscode-syntax-tree-0.3.0/node_modules/vscode-languageclient/node.js
- /Users/user/.vscode/extensions/ruby-syntax-tree.vscode-syntax-tree-0.3.0/out/extension.js
- /Applications/Visual Studio Code.app/Contents/Resources/app/out/vs/loader.js
- /Applications/Visual Studio Code.app/Contents/Resources/app/out/bootstrap-amd.js
- /Applications/Visual Studio Code.app/Contents/Resources/app/out/bootstrap-fork.js.

[kddnewton]

@xfalcox I think it should be working now (or at least it is on my machine). Please let me know if you have any other trouble.