Remove branchName property for branches with tags

This will allow us to remove these branches.

Author: greg0ire

.doctrine-project.json

@@ -18,25 +18,21 @@
         },
         {
             "name": "2.0",
-            "branchName": "2.0.x",
             "slug": "2.0",
             "maintained": false
         },
         {
             "name": "1.5",
-            "branchName": "1.5.x",
             "slug": "1.5",
             "maintained": false
         },
         {
             "name": "1.4",
-            "branchName": "1.4.x",
             "slug": "1.4",
             "maintained": false
         },
         {
             "name": "1.3",
-            "branchName": "1.3.x",
             "slug": "1.3",
             "maintained": false
         }