dropping 0.6 as a target version

Should still work though.

.travis.yml

@@ -3,7 +3,6 @@ language: node_js
 node_js:
   - 0.10
   - 0.8
-  - 0.6
 
 before_script:
   - psql -c 'create database knex_test;' -U postgres

test/index.js

@@ -1,7 +1,5 @@
 // Helps with error handling on errors swallowed by promises.
-var mocha = require('mocha');
-
-require("mocha-as-promised")(mocha);
+require("mocha-as-promised")();
 
 global.sinon = require("sinon");