v1.8.0

• Update log4j dependencies to v 2.16.0 (#287)
• log4j 2.15.0 - fixes security vulnerability CVE-2021-44228 (#285) (#286)
  This change removes Java 7 compatibility for rollbar-log4j2. See rollbar-log4j2/README.md for more details.
• Update PR template (#284)