Add "Task" to the ISSUE_TEMPLATE.md

[tballison]

What kind of issue is this?

• Question. This issue tracker is not the best place for questions. If you want to ask how to do
  something, or to understand why something isn't working the way you expect it to, use StackOverflow
  instead with the label 'stormcrawler': https://stackoverflow.com/questions/tagged/stormcrawler

• Bug report. If you’ve found a bug, please include a test if you can, it makes it a lot easier to fix things. Use the label 'bug' on the issue.

• Feature request. Please use the label 'wish' on the issue.

It might make sense to add a "Task" option to the issue template for dependency upgrades and other maintenance work that doesn't fall within "bug" or "feature request".

[tballison]

I'm opening this for discussion. I kind of want this, but I don't know if fellow devs would find it useful.