Add license header

apollo-environment/src/test/java/com/spotify/apollo/environment/ApolloConfigTest.java

@@ -1,3 +1,22 @@
+/*
+ * -\-\-
+ * Spotify Apollo API Environment
+ * --
+ * Copyright (C) 2013 - 2016 Spotify AB
+ * --
+ * Licensed 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.
+ * -/-/-
+ */
 package com.spotify.apollo.environment;
 
 import com.google.common.collect.ImmutableMap;