Require node 7 (for ES7 features)

Author: axic

.travis.yml

@@ -4,8 +4,7 @@ os:
 
 language: node_js
 node_js:
-  - "5"
-  - "6"
+  - "7"
 addons:
   apt:
     sources:
@@ -23,12 +22,12 @@ matrix:
   fast_finish: true
   include:
     - os: linux
-      node_js: "6"
+      node_js: "7"
       env: CXX=g++-4.8 TEST_SUITE=testVM
     - os: linux
-      node_js: "6"
+      node_js: "7"
       env: CXX=g++-4.8 TEST_SUITE=testBlockchain
     - os: linux
-      node_js: "6"
+      node_js: "7"
       env: CXX=g++-4.8 TEST_SUITE=lint
 script: npm run $TEST_SUITE

circle.yml

@@ -1,6 +1,6 @@
 machine:
   node:
-    version: 6.3.1
+    version: 7.1.0
 dependencies:
   pre:
     - "npm rebuild"