Fix tsconfig settings

Author: mrkvon

packages/koa/tsconfig.base.json

@@ -8,8 +8,7 @@
     "forceConsistentCasingInFileNames": true,
     "strict": true,
     "skipLibCheck": true,
-    "noImplicitAny": true,
-    "rootDir": "."
+    "noImplicitAny": true
   },
   "include": ["./src"],
   "exclude": ["./src/tests"]