Update package.json

Author: ctalkington

package.json

@@ -20,7 +20,7 @@
     "lib"
   ],
   "engines": {
-    "node": ">= 0.10.0"
+    "node": ">= 4"
   },
   "scripts": {
     "test": "mocha --reporter dot"
@@ -32,8 +32,8 @@
     "readable-stream": "^2.0.0"
   },
   "devDependencies": {
-    "chai": "^3.4.0",
-    "mocha": "^3.2.0",
+    "chai": "^4.0.0",
+    "mocha": "^5.0.0",
     "rimraf": "^2.4.3",
     "mkdirp": "^0.5.0"
   },
@@ -45,4 +45,4 @@
   "publishConfig": {
     "registry": "https://registry.npmjs.org/"
   }
-}
+}