3.20.0

• Deprecate subprocessDockerCall(). #2653
• Move wallTime to a label so we can use exact timestamps. #2664
• Capture and log standard output/error from batch systems. #2662
• Add an option to set custom AWS IAM roles. #2656
• Add a ToilNodeType tag to distinguish leader vs. workers. #2658
• Slurm: include both exit code and terminating signal in job return status. #2646
• Update requests package. #2610
• HTCondorBatchSystem(): fixes and features. #2647
• Update cwltool from 1.0.20180820141117 -> 1.0.20190228155703 #2609
• Add an option to set disableCaching to false. #2584
• Speed up S3 bucket deletion. #2597
• Tolerate missing jobs/workers in stats expando. #2533
• Add private IP support to node operations. #2569
• Encode logs for gzip. #2595

Bug Fixes

• Improve NoSuchFileException usage and robustness. #2593
• Make sure we always have current package lists. #2675
• Make sure to use --tmpdir-prefix to place workdir and jobstore. #2587
• Subprocess dockercall bytestring compatibility for py2/3. #2677
• Address python3 deprecation warnings. #2668
• Fix python3.7 break on new static method. #2659
• Get value of taskId in Mesos' killTask method. #2661
• Stop NamedTemporaryFile tampering. #2638
• StatsAndLogging(): ensure json.load() receives only string input. #2641
• Reduce max size of files allowed to be inlined in SDB. #2440
• Increase hardcoded encapsulate follow-on resources. #2591
• Ensure TOIL_DOCKER_REGISTRY variable is in version_template. #2583
• Use current python executable. #2599

Thank you to our contributors: @mr-c, @arostamianfar, @adamnovak, @kwwette, @liinus, @saimeCS, @cdunn2001, @Fifan31, @jeffrey856!