Update migration class name with Rails version

[bronzdoc]

rails g model User name:string

will generate migration as shown below.

class CreateUsers < ActiveRecord::Migration
  def change
    create_table :users do |t|
      t.string :name
      t.timestamps null: false
    end
  end
end

In Rails 5 the same command will generate following migration.

class CreateUsers < ActiveRecord::Migration[5.0]
  def change
    create_table :users do |t|
      t.string :name
      t.timestamps
    end
  end
end

[arielj]

hey @bronzdoc I think you mixed the title of the issue with the description of another issue here

[bronzdoc]

@arielj fixed it 👍