chore(doc): Include Credits section in README.md. (#204)

Author: mikeproeng37

README.md

@@ -90,26 +90,44 @@ Results are generated in `$buildDir/reports/jmh`.
 
 Please see [CONTRIBUTING](CONTRIBUTING.md).
 
-## License
-```
-   Copyright 2016, Optimizely
+### Credits
 
-   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
+First-party code (under core-api/ and core-httpclient-impl) is copyright Optimizely, Inc. and contributors, licensed under Apache 2.0.
 
-       http://www.apache.org/licenses/LICENSE-2.0
+### Additional Code
 
-   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.
-```
+This software incorporates code from the following open source projects:
+
+#### core-api module
+
+**SLF4J** [https://www.slf4j.org ](https://www.slf4j.org)  
+Copyright © 2004-2017 QOS.ch  
+License (MIT): [https://www.slf4j.org/license.html](https://www.slf4j.org/license.html)
+
+**Jackson Annotations** [https://github.com/FasterXML/jackson-annotations](https://github.com/FasterXML/jackson-annotations)  
+License (Apache 2.0): [https://github.com/FasterXML/jackson-annotations/blob/master/src/main/resources/META-INF/LICENSE](https://github.com/FasterXML/jackson-annotations/blob/master/src/main/resources/META-INF/LICENSE)
+
+**Gson** [https://github.com/google/gson ](https://github.com/google/gson)  
+Copyright © 2008 Google Inc.
+License (Apache 2.0): [https://github.com/google/gson/blob/master/LICENSE](https://github.com/google/gson/blob/master/LICENSE)
+
+**JSON-java** [https://github.com/stleary/JSON-java](https://github.com/stleary/JSON-java)  
+Copyright © 2002 JSON.org 
+License (The JSON License): [https://github.com/stleary/JSON-java/blob/master/LICENSE](https://github.com/stleary/JSON-java/blob/master/LICENSE)
+
+**JSON.simple** [https://code.google.com/archive/p/json-simple/](https://code.google.com/archive/p/json-simple/)  
+Copyright © January 2004  
+License (Apache 2.0): [https://github.com/fangyidong/json-simple/blob/master/LICENSE.txt](https://github.com/fangyidong/json-simple/blob/master/LICENSE.txt)
+
+**Jackson Databind** [https://github.com/FasterXML/jackson-databind](https://github.com/FasterXML/jackson-databind)   
+License (Apache 2.0): [https://github.com/FasterXML/jackson-databind/blob/master/src/main/resources/META-INF/LICENSE](https://github.com/FasterXML/jackson-databind/blob/master/src/main/resources/META-INF/LICENSE)
+
+#### core-httpclient-impl module
+
+**Gson** [https://github.com/google/gson ](https://github.com/google/gson)  
+Copyright © 2008 Google Inc.
+License (Apache 2.0): [https://github.com/google/gson/blob/master/LICENSE](https://github.com/google/gson/blob/master/LICENSE)
 
-[JAR hell]: https://en.wikipedia.org/wiki/Java_Classloader#JAR_hell
-[developer_docs]: http://developers.optimizely.com/server/index.html
-[project_json]: http://developers.optimizely.com/server/reference/index.html#json
-[Optimizely]: core-api/src/main/java/com/optimizely/ab/Optimizely.java
-[Project Watcher]: core-api/src/main/java/com/optimizely/ab/config/ProjectWatcher.java
-[Event Handler]: core-api/src/main/java/com/optimizely/ab/event/EventHandler.java
+**Apache HttpClient** [https://hc.apache.org/httpcomponents-client-ga/index.html ](https://hc.apache.org/httpcomponents-client-ga/index.html)  
+Copyright © January 2004
+License (Apache 2.0): [https://github.com/apache/httpcomponents-client/blob/master/LICENSE.txt](https://github.com/apache/httpcomponents-client/blob/master/LICENSE.txt)