Add tests for node 6
Add tests for node 6
SimenB/html-webpack-plugin,jantimon/html-webpack-plugin,ampedandwired/html-webpack-plugin,SpaceK33z/html-webpack-plugin,SpaceK33z/html-webpack-plugin,ampedandwired/html-webpack-plugin,jantimon/html-webpack-plugin,SimenB/html-webpack-plugin