Git release notes

gistfile1.txt

#!/usr/bin/env bash

relnotes() {
    local from_ref=$1
    if [ "$#" -eq 2 ]; then
        local to_ref=$2
    elif [ "$#" -eq 1 ]; then
        local to_ref="HEAD"
    else
        echo "Usage: relnotes <from-ref> [<to-ref>]"
        return 1
    fi
    git log $from_ref..$to_ref --no-merges --pretty=format:"%s" |grep -vi bump | awk '{print "- ",$0}'
}

Save it in a git-functions.sh file and source it in your bashrc or bash_profile like so:
source $HOME/git-functions.sh