Update .travis.yml

Drop node@0.10 and node@0.12 from the test matrix.

Author: brianc

.travis.yml

@@ -2,18 +2,12 @@ language: node_js
 
 matrix:
   include:
-    - node_js: "0.10"
-      addons:
-        postgresql: "9.1"
-    - node_js: "0.12"
-      addons:
-        postgresql: "9.1"
     - node_js: "4"
       addons:
         postgresql: "9.1"
-    - node_js: "5"
-      addons:
-        postgresql: "9.4"
     - node_js: "6"
       addons:
         postgresql: "9.4"
+    - node_js: "8"
+      addons:
+        postgresql: "9.6"