Add changelog entries

Author: rbuckton

common/changes/@microsoft/api-documenter/updateApiModel_2019-06-08-04-52.json

@@ -0,0 +1,11 @@
+{
+  "changes": [
+    {
+      "packageName": "@microsoft/api-documenter",
+      "comment": "Add support for emitting type parameters in the YamlDocumenter",
+      "type": "patch"
+    }
+  ],
+  "packageName": "@microsoft/api-documenter",
+  "email": "[email protected]"
+}