docs(readme): add missing reference to concurrently
docs(readme): add missing reference to concurrently

angeltrickz/prueba_vulgar,rschellius/vulgar,datatypevoid/ng2-mean-webpack,datatypevoid/vulgar,kuiqiang/cvp,datatypevoid/ng2-mean-webpack,gunnertech/rednotebook,kuiqiang/cvp,juansaucedo/develook,kuiqiang/cvp,angeltrickz/prueba_vulgar,juansaucedo/develook,Spirovanni/ampdin,juansaucedo/develook,datatypevoid/vulgar,datatypevoid/ng2-mean-webpack,angeltrickz/prueba_vulgar,rschellius/vulgar,Spirovanni/ampdin,rschellius/vulgar,datatypevoid/vulgar,Spirovanni/ampdin