- Package Updates (mocha & jshint)

- Converted to a private package so that it can easily be used as local package with npm link without messing up with "npm update" and "npm outdated" commands.+-

package.json

@@ -1,6 +1,7 @@
 {
   "name": "@abandonware/bleno",
   "version": "0.5.1-0",
+  "private": true,
   "description": "A Node.js module for implementing BLE (Bluetooth Low Energy) peripherals",
   "main": "index.js",
   "engines": {
@@ -35,10 +36,10 @@
   "license": "MIT",
   "readmeFilename": "README.md",
   "devDependencies": {
-    "jshint": "~2.9.7",
-    "should": "~13.2.3",
-    "mocha": "~5.2.0",
-    "node-blink1": "~0.2.3"
+    "jshint": "^2.10.1",
+    "mocha": "^6.0.2",
+    "node-blink1": "~0.2.3",
+    "should": "~13.2.3"
   },
   "dependencies": {
     "debug": "^4.1.1"