crypton-x509-system-1.6.8: ChangeLog.md

# ChangeLog for crypton-x509-system

## 1.6.8

* Prefer OpenSSL env vars: SSL_CERT_FILE and SSL_CERT_DIR
  [#26](https://github.com/kazu-yamamoto/crypton-certificate/pull/26)
* Unix defaultSystemPaths: add new Fedora default cert filepath
  [#19](https://github.com/kazu-yamamoto/crypton-certificate/pull/19)