chore(package): update coveralls to version 2.13.0 (#1570)
chore(package): update coveralls to version 2.13.0 (#1570)

https://greenkeeper.io/
arunoda/next.js,zeit/next.js,flybayer/next.js,BlancheXu/test,zeit/next.js,callumlocke/next.js,JeromeFitz/next.js,azukaru/next.js,kevmannn/next.js,azukaru/next.js,flybayer/next.js,azukaru/next.js,azukaru/next.js,nahue/next.js,zeit/next.js,JeromeFitz/next.js,giacomorebonato/next.js,BlancheXu/test,nelak/next.js,flybayer/next.js,dizlexik/next.js,JeromeFitz/next.js,BlancheXu/test,JeromeFitz/next.js,flybayer/next.js,kpdecker/next.js