Check node version

app.js

@@ -2,8 +2,16 @@ var http = require('http');
 var https = require('https');
 var path = require('path');
 var fs = require('fs');
-
 var _ = require('underscore');
+var semver = require('semver');
+
+var ver = process.versions.node;
+ver = ver.split('-')[0]; // explode and truncate tag from version #511
+
+if (!semver.satisfies(ver, '>6.9.0')) {
+    console.log('Node version ' + ver + ' is not supported, please use Node.js 6.9 or higher.');
+    process.exit(1);
+}
 
 // jshint undef:false
 var log = console.log.bind(console);

package.json

@@ -35,6 +35,7 @@
     "queue-async": "~1.0.7",
     "redis-mpool": "0.4.1",
     "request": "~2.79.0",
+    "semver": "~5.3.0",
     "step": "~0.0.6",
     "step-profiler": "~0.3.0",
     "turbo-carto": "0.19.0",
@@ -48,7 +49,6 @@
     "mocha": "~1.21.4",
     "nock": "~2.11.0",
     "redis": "~0.12.1",
-    "semver": "~1.1.4",
     "strftime": "~0.8.2"
   },
   "scripts": {