title: Android Room change type of column with Migration
body: <p>I didn't find any answer to what I'm searching for so I'm sending this question.</p>
  
  <p>I am using Room for Android.</p>
  
  <p>I have an Entity with an Int column and I need to change it to Double, and I don't know how to do it.</p>
  
  <p>Does anybody know how to do it?</p>
  
  <p>My question might be dumb, but I didn't find any answer on stackoverflow/any google search.</p>