ikiwiki/ news/ version 3.20180311

ikiwiki 3.20180311 released with these changes

- [ Amitai Schleier ]
  - Avoid unexpected full paths from find(1)
- [ thm.id.fedoraproject.org ]
  - rst test: Probe for docutils Python 3 module, not Python 2
- [ Simon McVittie ]
  - mdwn: Automatically detect which Discount flags to use, fixing regressions in 3.20180228 when using Discount < 2.2
  - Add a test asserting that no plugin is an empty file, to confirm that the build fixes in 3.20180228 were successful