Drop Node 0.8 from travis build
Drop Node 0.8 from travis build

There's a rogue setImmediate somewhere in a dependency that has
broken the tests on 0.8.

As we're dropping 0.8 support from Node-red, there's little point
tracking this down.

drwoods/node-red-web-nodes,SenseTecnic/node-red-web-nodes,drwoods/node-red-web-nodes,mblackstock/node-red-web-nodes,SenseTecnic/node-red-web-nodes,node-red/node-red-web-nodes,node-red/node-red-web-nodes,mblackstock/node-red-web-nodes