docs: string require double quotes
Otherwise the following error will be shown: `Syntax error in ... unterminated char literal, use double quotes for strings` Tested with crystal --version Crystal 0.10.0 (Wed Dec 23 21:19:16 UTC 2015)
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@ -44,7 +44,7 @@ Installing kemal (master)
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Open `your_app/src/your_app.cr` and require `kemal` to use Kemal.
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```ruby
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require 'kemal'
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require "kemal"
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```
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## 4. Hack your project
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