Release preparation

[arvoelke]

• [x] Update Travis CI to newest nengo release(s)
• [x] Update README for supported nengo versions
• [x] Add changelog
• [x] Switch intersphinx to new nengo docs
• [x] Include https://arxiv.org/abs/1708.08133 and update NECO article to preprint status in success stories
• [x] Include license in release files

[codecov-io]

Codecov Report

Merging #120 into master will not change coverage. The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #120   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          28     28           
  Lines        1346   1324   -22     
  Branches      159    155    -4     
=====================================
- Hits         1346   1324   -22

Impacted Files	Coverage Δ
nengolib/networks/rolling_window.py	100% <ø> (ø)	:arrow_up:
nengolib/version.py	100% <100%> (ø)	:arrow_up:

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update d6258f0...0006906. Read the comment docs.

[arvoelke]

https://github.com/arvoelke/nengolib/pull/130

• Added changelog (won't release as a part of official docs yet since it's kind of boring)
• Testing up to nengo==2.6.0 (and master)