Schema migration in CakePHP-3

Hello Everyone, 

I am trying to create a custom plugin for CakePHP-3.0 where I want to include schema migrations [database sql queries] so that when plugin gets installed eventually migrations for the same plugin will run and tables required by the plugin will get created in users database. 

I have created a Migration class under PluginName/config/Migrations/

when I do "bin/cake migrations migrate --plugin pluginName" -- I am getting success message but when I check my database no table is created. 

please find enclosed here with gist of migration class and output of the above command. 

https://gist.github.com/aavrug/940634042245f9632d59

Thank you. 

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