v0.18.6

Dagger v0.18.6

Diff since v0.18.5

Various bugfixes:

• Removed some 1- and 2-letter exports that could conflict with user variables
• Skipped accidental hashing of arbitrary task arguments in the scheduler
• Fixed with_options not merging new options with previously-set options (yikes!)

Merged pull requests:

• DaggerWebDash: Use gethostname and getipaddr (#451) (@jpsamaroo)
• Don't export Bytes constants (#458) (@jpsamaroo)
• reschedule_inputs: Don't hash non-Thunk inputs (#460) (@jpsamaroo)
• tests: Test for previous option preservation (#461) (@jpsamaroo)