suitable upgrade to 0.2.6

[rksm]

This fixes calls to suitable when the completion context contains no
__prefix__ (e.g. when typing the metadata of a ns like (ns ^foo| bar.baz))

Before submitting a PR make sure the following things have been done:

• The commits are consistent with our contribution guidelines
• You've added tests to cover your change(s)
• All tests are passing
• The new code is not generating reflection warnings
• You've updated the README (if adding/changing middleware)

Note: If you're just starting out to hack on cider-nrepl you might find
nREPL's documentation and the
"Design" section of the README extremely useful.*

Thanks!

[bbatsov]

Thanks!