move @types/levelup from devDeps to deps

Author: ryanio

package.json

@@ -49,6 +49,7 @@
   ],
   "license": "MPL-2.0",
   "dependencies": {
+    "@types/levelup": "^3.1.1",
     "ethereumjs-util": "^7.0.0",
     "level-mem": "^5.0.1",
     "level-ws": "^2.0.0",
@@ -62,7 +63,6 @@
     "@ethereumjs/config-tsc": "^1.1.1",
     "@ethereumjs/config-tslint": "^1.1.1",
     "@types/bn.js": "^4.11.5",
-    "@types/levelup": "^3.1.1",
     "@types/tape": "^4.2.34",
     "husky": "^4.2.3",
     "karma": "^4.4.1",