Add dotenv types

package.json

@@ -10,6 +10,7 @@
   "dependencies": {
     "@extollo/di": "file:../di",
     "@extollo/util": "file:../util",
+    "@types/dotenv": "^8.2.0",
     "@types/negotiator": "^0.6.1",
     "@types/pug": "^2.0.4",
     "dotenv": "^8.2.0",
@@ -17,7 +18,6 @@
     "pug": "^3.0.2",
     "typescript": "^4.1.3"
   },
-  "devDependencies": {},
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1",
     "build": "tsc",