Custom App Namespace & Better migration generation

This release contains two major updates.

• Package can be used with Custom App Namespace. (refer document: https://github.com/mitulgolakiya/laravel-api-generator#using-with-custom-application-namespace)
  
• Better migration generation where you can give any number of inputs and options e.g.
  
  name:string,255:nullable
  
  amount:float,8,3
  
  user_id:foreign:references,id:on,users:onDelete,cascade