Remove mention of Node 4.x incompatibility.
Remove mention of Node 4.x incompatibility.

kennethlimcp/particle-cli,kennethlimcp/particle-cli,spark/particle-cli,kennethlimcp/particle-cli,spark/particle-cli,spark/particle-cli,kennethlimcp/particle-cli,spark/particle-cli,spark/particle-cli,kennethlimcp/particle-cli,kennethlimcp/particle-cli,spark/particle-cli