Update package.json

Author: gabrieledeluca

package.json

@@ -43,7 +43,7 @@
     "body-parser": "^1.18.3",
     "command-shell-lib": "1.0.0",
     "express": "^4.16.3",
-    "handlebars": "^4.0.13",
+    "handlebars": "^4.3.0",
     "http": "0.0.0",
     "iotagent-node-lib": "https://github.com/telefonicaid/iotagent-node-lib.git",
     "jison": "0.4.17",