chore: consolidate eslint configs (#109)

diff --git a/.eslintrc.yml b/.eslintrc.yml
index f540d52..b31d8d3 100644
--- a/.eslintrc.yml
+++ b/.eslintrc.yml
@@ -1,6 +1,27 @@
+# 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.
+
 root: true
 extends: '@cordova/eslint-config/node'
 
+overrides:
+  - files: [spec/**/*.js]
+    extends: '@cordova/eslint-config/node-tests'
+
 rules:
   no-unused-vars:
     - error
diff --git a/spec/.eslintrc.yml b/spec/.eslintrc.yml
deleted file mode 100644
index f2c42a4..0000000
--- a/spec/.eslintrc.yml
+++ /dev/null
@@ -1,2 +0,0 @@
-root: true
-extends: '@cordova/eslint-config/node-tests'