Increased time before reporting of library download duration goes red to 4 seconds.

Incrased travis build version to node 8, as embark only supports 8.10, and also perf_hooks requires 8.5

.travis.yml

@@ -1,6 +1,6 @@
 language: node_js
 node_js:
-    - "7"
+    - "8"
 addons:
     code_climate:
         repo_token: 7454b1a666015e244c384d19f48c34e35d1ae58c3aa428ec542f10bbcb848358

lib/versions/npm.js

@@ -43,7 +43,7 @@ class Npm {
       
       // log our measurement and make it red if it has taken too long
       if(entry && strDuration){
-        if(entry.duration > 1000){
+        if(entry.duration > 4000){
           strDuration = strDuration.red;
         }
         this.logger.info(strDuration);