chore(package): update coveralls to version 2.13.1 (#1822)
chore(package): update coveralls to version 2.13.1 (#1822)

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