Fix missing activation event manifest

Yukaii · Yukaii · commit baf840d82e7b · 2019-09-01T22:15:23.000+08:00
diff --git a/package.json b/package.json
@@ -12,6 +12,9 @@
     "color": "#333333",
     "theme": "dark"
   },
+  "activationEvents": [
+
+  ],
   "license": "MIT",
   "homepage": "https://github.com/hackmdio/vscode-hackmd/blob/master/README.md",
   "bugs": {
