Remove nonexistent branch from publish config (dotnet#7216)

scottaddie · web-flow · commit 4b6d590bf14d · 2018-06-21T15:37:05.000-05:00
The "aspnetmigration" branch doesn't exist, so this section of the publish config should be deleted.
diff --git a/.openpublishing.publish.config.json b/.openpublishing.publish.config.json
@@ -19,10 +19,6 @@
     "master": [
       "Publish",
       "Pdf"
-    ],
-    "aspnetmigration": [
-      "Publish",
-      "Pdf"
     ]
   },
   "docsets_to_publish": [
