[travis] shapeup package.json in release

remove devDependencies from package.json.
resolve #495.

.travis/release.sh

@@ -7,6 +7,7 @@ chmod 600 ~/.ssh/id_rsa
 echo -e "Host github.com\n\tStrictHostKeyChecking no\n" >> ~/.ssh/config
 git checkout -b release
 cp -f ./.travis/.gitignore-release .gitignore
+node ./.travis/shapeup.js
 git add --all
 git rm --cached `git ls-files --full-name -i --exclude-standard`
 git config --global user.email "AyaMorisawa4869@gmail.com"

.travis/shapeup.js

@@ -0,0 +1,13 @@
+'use strict'
+
+const fs = require('fs')
+const filename = process.argv[2] || 'package.json'
+
+fs.readFile(filename, (err, data) => {
+    if (err) process.exit(2)
+    const object = JSON.parse(data)
+    delete object.devDependencies
+    fs.writeFile(filename, JSON.stringify(object, null, 4) + '\n', err => {
+        if (err) process.exit(3)
+    })
+})