Missing ! in examples/using-preact server.js

[cdock1029]

// For the development version, we'll use React.
// Because, it support react hot loading and so on.
if (dev) {
  moduleAlias.addAlias('react', 'preact-compat')
  moduleAlias.addAlias('react-dom', 'preact-compat')
}

Intend to add alias when not dev correct?

using-preact/server.js#L6