upgrade deps and travis

.travis.yml

@@ -1,4 +1,5 @@
 language: node_js
 node_js:
-- '5'
-- '4'
+  - 4
+  - 5
+  - 6

package.json

@@ -35,7 +35,7 @@
     "config-master": "^2.0.2",
     "debug": "^2.2.0",
     "http-proxy": "^1.13.2",
-    "kcors": "^1.1.0",
+    "kcors": "^1.2.0",
     "koa": "^2.0.0",
     "koa-bodyparser": "^3.0.0",
     "koa-compress": "^1.0.9",
@@ -43,7 +43,7 @@
     "koa-connect-history-api-fallback": "^0.3.0",
     "koa-convert": "^1.2.0",
     "koa-etag": "^2.1.1",
-    "koa-json": "^1.1.1",
+    "koa-json": "^1.1.3",
     "koa-morgan": "^1.0.1",
     "koa-rewrite": "^2.1.0",
     "koa-route": "^3",
@@ -58,7 +58,7 @@
     "typical": "^2.4.2"
   },
   "devDependencies": {
-    "jsdoc-to-markdown": "^1.3.4",
+    "jsdoc-to-markdown": "^1.3.6",
     "req-then": "^0.2.4",
     "tape": "^4.5.1"
   }