Remove version.yml

First version on mynewt-core using mcumgr will be 1.8 which will no
longer require version.yml.
diff --git a/version.yml b/version.yml
deleted file mode 100644
index 13e5152..0000000
--- a/version.yml
+++ /dev/null
@@ -1,22 +0,0 @@
-#
-# Licensed to the Apache Software Foundation (ASF) under one
-# or more contributor license agreements.  See the NOTICE file
-# distributed with this work for additional information
-# regarding copyright ownership.  The ASF licenses this file
-# to you under the Apache License, Version 2.0 (the
-# "License"); you may not use this file except in compliance
-# with the License.  You may obtain a copy of the License at
-#
-#  http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing,
-# software distributed under the License is distributed on an
-# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
-# KIND, either express or implied.  See the License for the
-# specific language governing permissions and limitations
-# under the License.
-#
-
-# Newt uses this file to determine the version of a checked out repo.
-# This should always be 0.0.0 in the master branch.
-repo.version: 0.0.0