Update .travis.yml
Update .travis.yml

Node.js v0.6 and v0.8 are EOL.
Node.js v.0.10 and v0.12 are available for now.
fluent/fluent-logger-node,e-jigsaw/fluent-logger-node,leobudima/fluent-logger-node,okkez/fluent-logger-node,jahraphael/fluent-logger-node,TMDer/fluent-logger-node