Update license to EPL v2
EPL v2 was released in 2017 and deprecates the EPL v1 under which the project is currently licensed. I believe the following changes follow EPL directions to update to the current version of the license.
See https://www.eclipse.org/legal/epl-2.0/faq.php#h.tci84nlsqpgw
- /epl-v10.html
- /epl-v10.txt
- /COPYING
- /LICENSE
- /epl-v20.html
- /epl-v20.txt
- /CHANGELOG.md