README: use correct column name, update markdown code blocks

README.md

@@ -19,7 +19,6 @@ Once that's done, run:
 
     bundle install
 
-
 ### Automatic installation
 
 In order to add two factor authorisation to a model, run the command:
@@ -27,7 +26,7 @@ In order to add two factor authorisation to a model, run the command:
     bundle exec rails g two_factor_authentication MODEL
 
 Where MODEL is your model name (e.g. User or Admin). This generator will add `:two_factor_authenticatable` to your model
-and create a migration in `db/migrate/`, which will add `::second_factor_pass_code` and `:second_factor_attempts_count` to your table.
+and create a migration in `db/migrate/`, which will add `:otp_secret_key` and `:second_factor_attempts_count` to your table.
 Finally, run the migration with:
 
     bundle exec rake db:migrate
@@ -38,14 +37,18 @@ Add the following line to your model to fully enable two-factor auth:
 
 Set config values if desired for maximum second factor attempts count and allowed time drift for one-time passwords:
 
+```ruby
 config.max_login_attempts = 3
 config.allowed_otp_drift_seconds = 30
+```
 
 Override the method to send one-time passwords in your model, this is automatically called when a user logs in:
 
+```ruby
 def send_two_factor_authentication_code
   # use Model#otp_code and send via SMS, etc.
 end
+```
 
 ### Manual installation
 
@@ -62,14 +65,18 @@ Add the following line to your model to fully enable two-factor auth:
 
 Set config values if desired for maximum second factor attempts count and allowed time drift for one-time passwords:
 
+```ruby
 config.max_login_attempts = 3
 config.allowed_otp_drift_seconds = 30
+```
 
 Override the method to send one-time passwords in your model, this is automatically called when a user logs in:
 
+```ruby
 def send_two_factor_authentication_code
   # use Model#otp_code and send via SMS, etc.
 end
+```
 
 ### Customisation and Usage