yarn.lock -> package-lock.json

Fixes microsoft#712

Author: Tyriar

.gitignore

@@ -8,7 +8,7 @@ node_modules/
 builderror.log
 lib/
 npm-debug.log
-package-lock.json
 fixtures/space folder/
 .vscode/settings.json
 .vscode/ipch/
+yarn.lock