Brings the client up-to-date with Nvim 0.2.1.
Changes since 0.1.13:
- a2e1169 Fix tests on windows (#201)
- 9a0e729 Fix an indexing bug when setting lines in a Range object (#270)
- 4abd5d0 Documentation update (#272)
- a703b47 Make sure logging always uses UTF-8 regardless of locale (#276)
- 68aa352 Add argument to allow nested notification handlers (#262)
