v6.0.0-node10.0

• remove node 4 support 849f54a
• remove unused dep - lodash dc28a5e
• Fix travis caching. 603d5d0
• need mocha --exit 8c6cfd0
• Fix test. 7697053
• clean up dev deps e2be75f
• latest q 8be7806
• latest async 647633a
• latest mocha c0867d9
• semistandard fixes 3cf14bf
• Latest amqplib bdb3d51
• Test on node 10. 6b19e45

v5.5.2...v6.0.0-node10.0