Upgrade dependencies

Improve example (fix coding style, fix Buffer usage)
Fix coding style in lib/pcsclite.js

package.json

@@ -12,6 +12,10 @@
   "bugs": {
     "url": "https://github.com/pokusew/node-pcsclite/issues"
   },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/pokusew/node-pcsclite.git"
+  },
   "license": "ISC",
   "author": {
     "name": "Santiago Gimeno",
@@ -28,22 +32,18 @@
   "directories": {
     "test": "test"
   },
-  "repository": {
-    "type": "git",
-    "url": "https://github.com/pokusew/node-pcsclite.git"
-  },
   "scripts": {
     "install": "node-gyp rebuild",
     "test": "mocha"
   },
   "dependencies": {
-    "bindings": "^1.3.0",
-    "nan": "^2.7.0"
+    "bindings": "^1.3.1",
+    "nan": "^2.12.1"
   },
   "devDependencies": {
-    "mocha": "^3.5.0",
-    "should": "^12.0.0",
-    "sinon": "^3.2.1"
+    "mocha": "^5.2.0",
+    "should": "^13.2.3",
+    "sinon": "^7.2.2"
   },
   "gypfile": true
 }