fix broken link on npmjs.org

Presently, this package links to a 404 - Not Found error. This commit fixes the link.

Author: switch-to-gitlab

server/package.json

@@ -20,7 +20,7 @@
   "engines": {
     "node": "*"
   },
-  "homepage": "https://github.com/rescript-lang/rescript-vscode/server/README.md",
+  "homepage": "https://github.com/rescript-lang/rescript-vscode/blob/master/server/README.md",
   "repository": {
     "type": "git",
     "url": "https://github.com/rescript-lang/rescript-vscode",