update docs (for npm 5.x)

README.md

@@ -77,7 +77,7 @@ On-premise
 ### Dependencies
 
 - node 6.x (DON'T USE 7.x)
-- npm 4.x
+- npm 5.x
 - yarn
 - MongoDB 3.x
 

package.json

@@ -133,7 +133,7 @@
   },
   "engines": {
     "node": "6.x",
-    "npm": "4.x"
+    "npm": "5.x"
   },
   "config": {
     "blanket": {