Voting Active on PR#365 -- abbreviated syntax for passthrough call inputs

[Mike Lin]

https://github.com/openwdl/wdl/pull/365

This is a small syntactic convenience for calls in workflows -- when we're providing a call input xyz = xyz (binding a workflow-scoped value to a task input of the same name -- a common occurrence for e.g. reference databases and docker image tags), we can just write xyz.

Please weigh in!