prebuild --install fails on Node 6

[capaj]

see https://api.travis-ci.org/jobs/125934637/log.txt?deansi=true

[ralphtheninja]

From the log output you just linked

Starting with io.js 3 and Node.js 4, building native extensions requires C++11-compatible compiler, which seems unavailable on this VM. Please read https://docs.travis-ci.com/user/languages/javascript-with-nodejs#Node.js-v4-(or-io.js-v3)-compiler-requirements.

[ralphtheninja]

Just updated leveldown on travis to use node 6 and it builds fine #280, you can take a peek at leveldowns .travis.yml file here https://github.com/Level/leveldown/blob/master/.travis.yml#L5-L13 on how to use C++11

[capaj]

@ralphtheninja thanks, did not realize travis needed this. Now builds just fine.

[ralphtheninja]

@ralphtheninja thanks, did not realize travis needed this. Now builds just fine.

👍