Proposing a PR to fix a few small typos

[timgates42]

Issue Type

[x] Bug (Typo)

Steps to Replicate and Expected Behaviour

• Examine test/test_task.py and observe existant, however expect to see existent.
• Examine README.md and observe examing, however expect to see examining.
• Examine README.md and observe availble, however expect to see available.
• Examine shovel/runner.py and observe accomodate, however expect to see accommodate.

Notes

Semi-automated issue generated by
https://github.com/timgates42/meticulous/blob/master/docs/NOTE.md

To avoid wasting CI processing resources a branch with the fix has been
prepared but a pull request has not yet been created. A pull request fixing
the issue can be prepared from the link below, feel free to create it or
request @timgates42 create the PR.

https://github.com/timgates42/shovel/pull/new/bugfix_typos

Thanks.