title: Rails Migration: How to increase column data type size by using ROR migration
body: <p>My users table login column is String type with limit of 40 characters.
  Now I am planning to increase the limit to 55 characters.</p>
  
  <p>Any one please let me know how can we increase this limit by using ROR migration.</p>
  
  <p>Thanks,
  Sravan</p>