fix: update first-mate, adding support for Node 6 (#44)

Author: ashleygwilliams

.travis.yml

@@ -10,7 +10,7 @@ node_js:
   - 0.12
   - iojs
   - 4
-  - 5
+  - 6
 
 before_install:
   - sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test

package.json

@@ -20,7 +20,7 @@
   },
   "homepage": "https://github.com/atom/highlights",
   "dependencies": {
-    "first-mate": "^5.1.1",
+    "first-mate": "^6.0.0",
     "first-mate-select-grammar": "^1.0.1",
     "fs-plus": "^2.2.6",
     "once": "^1.3.2",