[fix] upgrade dependencies with potential security vulnerabilities

upgrade js-yaml, eslint, mixin-deep & handlebars

package.json

@@ -77,7 +77,7 @@
     "express-fileupload": "0.0.5",
     "inquirer": "3.0.6",
     "jison": "0.4.17",
-    "js-yaml": "3.8.2",
+    "js-yaml": "3.13.1",
     "leveldown": "^4.0.1",
     "levelup": "^4.0.0",
     "memdown": "^3.0.0",
@@ -117,7 +117,7 @@
     "@types/should": "^8.3.0",
     "@types/ws": "^5.1.2",
     "coveralls": "2.11.4",
-    "eslint": "3.13.1",
+    "eslint": "4.18.2",
     "eslint-plugin-mocha": "4.8.0",
     "mocha": "^3.4.2",
     "mocha-eslint": "0.1.7",