Bump NPM packages and Node version allowed

Signed-off-by: Michael Bridgen <mikeb@squaremobius.net>

Author: squaremo

Makefile

@@ -3,7 +3,7 @@ JSON=amqp-rabbitmq-0.9.1.json
 RABBITMQ_CODEGEN=https://raw.githubusercontent.com/rabbitmq/rabbitmq-codegen
 AMQP_JSON=$(RABBITMQ_CODEGEN)/$(RABBITMQ_SRC_VERSION)/$(JSON)
 
-NODEJS_VERSIONS='0.8' '0.9' '0.10' '0.11' '0.12' '1.8.4' '2.5' '3.3' '4.9' '5.12' '6.17' '8.17' '9.11' '10.21' '11.15' '12.18' '13.14' '14.5'
+NODEJS_VERSIONS='0.8' '0.9' '0.10' '0.11' '0.12' '1.8.4' '2.5' '3.3' '4.9' '5.12' '6.17' '8.17' '9.11' '10.21' '11.15' '12.18' '13.14' '14.5' '15.8'
 
 MOCHA=./node_modules/.bin/mocha
 _MOCHA=./node_modules/.bin/_mocha