Update Travis and stack brew for v4.7.0

.travis.yml

@@ -9,6 +9,6 @@ script:
 env:
     matrix :
         - NODE_VERSION: '0.12'
-        - NODE_VERSION: '4.6'
+        - NODE_VERSION: '4.7'
         - NODE_VERSION: '6.9'
         - NODE_VERSION: '7.2'

generate-stackbrew-library.sh

@@ -4,7 +4,7 @@ set -e
 hash git 2>/dev/null || { echo >&2 "git not found, exiting."; }
 
 array_0_12='0';
-array_4_6='4 argon';
+array_4_7='4 argon';
 array_6_9='6 boron';
 array_7_2='7 latest';