Move website config to default branch

Adapts the website config to be compatible with the doctrine/doctrine-website#356 changes

Author: SenseException

.doctrine-project.json

@@ -3,26 +3,39 @@
     "shortName": "DoctrineMongoDBBundle",
     "slug": "doctrine-mongodb-bundle",
     "versions": [
+        {
+            "name": "4.3",
+            "branchName": "4.3.x",
+            "slug": "4.3",
+            "current": true,
+            "aliases": [
+                "current",
+                "stable"
+            ]
+        },
+        {
+            "name": "4.2",
+            "branchName": "4.2.x",
+            "slug": "4.2",
+            "maintained": false
+        },
         {
             "name": "4.1",
-            "branchName": "master",
-            "slug": "latest",
-            "upcoming": true
+            "branchName": "4.1.x",
+            "slug": "4.1",
+            "maintained": false
         },
         {
             "name": "4.0",
             "branchName": "4.0.x",
             "slug": "4.0",
-            "current": true,
-            "aliases": [
-                "current",
-                "stable"
-            ]
+            "maintained": false
         },
         {
             "name": "3.6",
             "branchName": "3.6.x",
-            "slug": "3.6"
+            "slug": "3.6",
+            "maintained": false
         },
         {
             "name": "3.5",