Add a check for the files expiration rule

[khalyomede]

Description

The generated files expirations rules are missing to check if the expire modules is ready to be used.

Reproduce the issue

Use the option fileExpirations and check on an Apache served website that the page displays an Apache error.

module.exports = {
  siteName: "Gridsome",
  plugins: [
    {
      use: "gridsome-plugin-htaccess",
      options: {
        fileExpirations: {
          fileTypes: {
            "image/jpeg": "access plus 1 week",
            "text/html": "access plus 1 hour",
            "application/javascript": "access plus 1 hour",
            "text/css": "access plus 1 hour"
          }
        },
      }
    }
  ]
}

Expected result

The rules should be wrapped by the <IfModule mod_expires.c> directive.

[khalyomede]

Fixed via 1e023c6. Upgrade to the version 0.2.1 to get the fix.