Document version of JaCoCo required in README

I don't see a description of the JaCoCo version needed to run Javafuzz. If I try to use the latest version of JaCoCo (0.8.8) I get a java.lang.NoSuchMethodException: org.jacoco.agent.rt.internal_b6258fc.Agent.getHitCount(boolean). If I use the version hosted at https://gitlab.com/gitlab-org/security-products/analyzers/fuzzers/javafuzz/-/raw/master/javafuzz-maven-plugin/src/main/resources/jacocoagent-exp.jar (not sure what version this is), then I get a java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.Long. I'm just trying to use javafuzz-core as a regular library (3rd party JAR).