adding Kohl Kinning to AUTHORS file (#4910)
adding Kohl Kinning to AUTHORS file (#4910)

adding a new contributor Kohl Kinning (@kohlkopf / @kohlk) to the AUTHORS file
closes #4910 
magicDGS/gatk,ksthesis/gatk,broadinstitute/hellbender,magicDGS/gatk,ksthesis/gatk,ksthesis/gatk,ksthesis/gatk,frank-y-liu/gatk,magicDGS/gatk,magicDGS/gatk,frank-y-liu/gatk,frank-y-liu/gatk,ksthesis/gatk,frank-y-liu/gatk,broadinstitute/hellbender,magicDGS/gatk,frank-y-liu/gatk,broadinstitute/hellbender,magicDGS/gatk,broadinstitute/hellbender,broadinstitute/hellbender,broadinstitute/hellbender,ksthesis/gatk,frank-y-liu/gatk