[ci] Do not test on node 4.1.0, use 4.2.0 instead

All versions in the range >=4.0.0 <4.2.0 are bugged.

Author: lpinca

.travis.yml

@@ -4,6 +4,6 @@ node_js:
   - "8"
   - "6"
   - "4"
-  - "4.1.0"
+  - "4.2.0"
 after_success:
   - "npm install coveralls@2 && nyc report --reporter=text-lcov | coveralls"

appveyor.yml

@@ -3,7 +3,7 @@ environment:
     - nodejs_version: "8"
     - nodejs_version: "6"
     - nodejs_version: "4"
-    - nodejs_version: "4.1.0"
+    - nodejs_version: "4.2.0"
 platform:
   - x86
   - x64