Update README.md to fix command to create a conda environment.(#4207)
Update README.md to fix command to create a conda environment.(#4207)


broadinstitute/hellbender,broadinstitute/hellbender,ksthesis/gatk,frank-y-liu/gatk,magicDGS/gatk,frank-y-liu/gatk,frank-y-liu/gatk,ksthesis/gatk,frank-y-liu/gatk,ksthesis/gatk,broadinstitute/hellbender,ksthesis/gatk,broadinstitute/hellbender,magicDGS/gatk,magicDGS/gatk,broadinstitute/hellbender,magicDGS/gatk,broadinstitute/hellbender,magicDGS/gatk,ksthesis/gatk,magicDGS/gatk,frank-y-liu/gatk,ksthesis/gatk,frank-y-liu/gatk