Update versionion number to 4 to match dev cycle

Prepare for version 4.3.0

package.json

@@ -1,6 +1,6 @@
 {
   "name": "ivprog",
-  "version": "1.2.0",
+  "version": "4.3.0",
   "description": "IMA para o ensino de programação",
   "main": "js/main.js",
   "scripts": {