Upgrade rocksdb from ^3.0.0 to ^4.0.0

greenkeeper[bot] · vweevers · commit 51dfde2db22c · 2019-06-08T14:15:27.000+02:00
diff --git a/package.json b/package.json
@@ -13,7 +13,7 @@
   },
   "dependencies": {
     "level-packager": "^4.0.0",
-    "rocksdb": "^3.0.0"
+    "rocksdb": "^4.0.0"
   },
   "devDependencies": {
     "coveralls": "^3.0.2",
