Use npm scripts for travis commands

.travis.yml

@@ -7,6 +7,5 @@ before_script:
 script:
 - awesome_bot README.md --allow-dupe --allow-redirect
 - awesome_bot README_*.md --allow-dupe --allow-redirect
-- node node_modules/doctoc/doctoc.js --github README.md README_*.md
-- test -z "`git diff -- README.md`"
-- test -z "`git diff -- README_*.md`"
+- npm run toc
+- npm run diff

package.json

@@ -3,6 +3,10 @@
   "name": "git-flight-rules",
   "version": "1.0.0",
   "description": "Flight rules for git",
+  "scripts": {
+    "toc": "doctoc --github README.md README_*.md",
+    "diff": "test -z \"`git diff -- README.md`\" && test -z \"`git diff -- README_*.md`\""
+  },
   "devDependencies": {
     "doctoc": "^1.3.0",
     "anchor-markdown-header": "thlorenz/anchor-markdown-header#master"