vcf2maf v1.6.19

• Updates and fixes to isoform lists from MSKCC and Uniprot
• New isoform list with MANE Select isoforms
• New isoform list for MSK users of merged Refseq+Ensembl VEP cache
• Faster Travis CI tests that run offline; Better Dockerfile
• Handle new start_retained_variant variant consequence
• Disable --filter-vcf option by default