README.md in lockbox-0.6.2 vs README.md in lockbox-0.6.3

@@ -70,11 +70,11 @@
 ## Active Record
 
 Create a migration with:
 
 ```ruby
-class AddEmailCiphertextToUsers < ActiveRecord::Migration[6.0]
+class AddEmailCiphertextToUsers < ActiveRecord::Migration[6.1]
   def change
     add_column :users, :email_ciphertext, :text
   end
 end
 ```
@@ -246,11 +246,11 @@
 **Note:** Action Text uses direct uploads for files, which cannot be encrypted with application-level encryption like Lockbox. This only encrypts the database field.
 
 Create a migration with:
 
 ```ruby
-class AddBodyCiphertextToRichTexts < ActiveRecord::Migration[6.0]
+class AddBodyCiphertextToRichTexts < ActiveRecord::Migration[6.1]
   def change
     add_column :action_text_rich_texts, :body_ciphertext, :text
   end
 end
 ```
@@ -377,11 +377,11 @@
 Encryption is applied to all versions after processing.
 
 You can mount the uploader [as normal](https://github.com/carrierwaveuploader/carrierwave#activerecord). With Active Record, this involves creating a migration:
 
 ```ruby
-class AddLicenseToUsers < ActiveRecord::Migration[6.0]
+class AddLicenseToUsers < ActiveRecord::Migration[6.1]
   def change
     add_column :users, :license, :string
   end
 end
 ```
@@ -566,16 +566,14 @@
 
 Update your model:
 
 ```ruby
 class User < ApplicationRecord
-  encrypts :email, previous_versions: [{key: previous_key}]
+  encrypts :email, previous_versions: [{master_key: previous_key}]
 end
 ```
 
-Use `master_key` instead of `key` if passing the master key.
-
 To rotate existing records, use:
 
 ```ruby
 Lockbox.rotate(User, attributes: [:email])
 ```
@@ -585,15 +583,13 @@
 ### Action Text
 
 Update your initializer:
 
 ```ruby
-Lockbox.encrypts_action_text_body(previous_versions: [{key: previous_key}])
+Lockbox.encrypts_action_text_body(previous_versions: [{master_key: previous_key}])
 ```
 
-Use `master_key` instead of `key` if passing the master key.
-
 To rotate existing records, use:
 
 ```ruby
 Lockbox.rotate(ActionText::RichText, attributes: [:body])
 ```
@@ -604,16 +600,14 @@
 
 Update your model:
 
 ```ruby
 class User < ApplicationRecord
-  encrypts_attached :license, previous_versions: [{key: previous_key}]
+  encrypts_attached :license, previous_versions: [{master_key: previous_key}]
 end
 ```
 
-Use `master_key` instead of `key` if passing the master key.
-
 To rotate existing files, use:
 
 ```ruby
 User.with_attached_license.find_each do |user|
   user.license.rotate_encryption!
@@ -626,16 +620,14 @@
 
 Update your model:
 
 ```ruby
 class LicenseUploader < CarrierWave::Uploader::Base
-  encrypt previous_versions: [{key: previous_key}]
+  encrypt previous_versions: [{master_key: previous_key}]
 end
 ```
 
-Use `master_key` instead of `key` if passing the master key.
-
 To rotate existing files, use:
 
 ```ruby
 User.find_each do |user|
   user.license.rotate_encryption!
@@ -706,11 +698,11 @@
 - an IETF standard
 - fast thanks to a [dedicated instruction set](https://en.wikipedia.org/wiki/AES_instruction_set)
 
 Lockbox uses 256-bit keys.
 
-**For users who do a lot of encryptions:** You should rotate an individual key after 2 billion encryptions to minimize the chance of a [nonce collision](https://www.cryptologie.net/article/402/is-symmetric-security-solved/), which will expose the key. Each database field and file uploader use a different key (derived from the master key) to extend this window.
+**For users who do a lot of encryptions:** You should rotate an individual key after 2 billion encryptions to minimize the chance of a [nonce collision](https://www.cryptologie.net/article/402/is-symmetric-security-solved/), which will expose the authentication key. Each database field and file uploader use a different key (derived from the master key) to extend this window.
 
 ### XSalsa20
 
 You can also use XSalsa20, which uses an extended nonce so you don’t have to worry about nonce collisions. First, [install Libsodium](https://github.com/crypto-rb/rbnacl/wiki/Installing-libsodium). For Homebrew, use:
 
@@ -995,11 +987,11 @@
 ## Binary Columns
 
 You can use `binary` columns for the ciphertext instead of `text` columns.
 
 ```ruby
-class AddEmailCiphertextToUsers < ActiveRecord::Migration[6.0]
+class AddEmailCiphertextToUsers < ActiveRecord::Migration[6.1]
   def change
     add_column :users, :email_ciphertext, :binary
   end
 end
 ```
@@ -1040,11 +1032,11 @@
 ```
 
 Create a migration with:
 
 ```ruby
-class MigrateToLockbox < ActiveRecord::Migration[6.0]
+class MigrateToLockbox < ActiveRecord::Migration[6.1]
   def change
     add_column :users, :name_ciphertext, :text
     add_column :users, :email_ciphertext, :text
   end
 end
@@ -1073,10 +1065,10 @@
 ```
 
 Then remove the previous gem from your Gemfile and drop its columns.
 
 ```ruby
-class RemovePreviousEncryptedColumns < ActiveRecord::Migration[6.0]
+class RemovePreviousEncryptedColumns < ActiveRecord::Migration[6.1]
   def change
     remove_column :users, :encrypted_name, :text
     remove_column :users, :encrypted_name_iv, :text
     remove_column :users, :encrypted_email, :text
     remove_column :users, :encrypted_email_iv, :text