Updating the README.md to point to the Dataproc wiki page.
Updating the README.md to point to the Dataproc wiki page.

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