CHANGELOG.md in plezi-0.12.4 vs CHANGELOG.md in plezi-0.12.5

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 #Change Log
 
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+Change log v.0.12.5
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+**Fix**: Placebo's older Rack recognition required that Rack be required within the gemfile of the application. This is no longer the case. Now `start_placebo` can also be used in a non-Rack environment (i.e. when disabling the server using: `Plezi.protocol = :placebo`). This allows writing Plezi based "worker" scripts that aren't web servers but can send and receive messages from the main application.
 
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 Change log v.0.12.4
 
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