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Tarball on npm is corrupt. So I just republish it. Nothing change.

Notice: The tarball of this version is corrupt on npm. Don't install this version.

• Improve document
• Fix issue #30

• Drop requirement of Promise and Object.assign
  This will increase a little bundle size.
  But you can remove es6-shim in your website.
• Allow multiple instance

I forgot to rename attribute name....

Breaking Change

• Rename props key -> sitekey (fixed #20)

• Use rollup to bundle.
  • Pro: reduce bundle size 6.1k -> 2.8k.
• Provide minify build.

Breaking

• Support Vue2.0

Nothing update. Just force npm to update readme.