README.md in data_cleansing-0.5.0 vs README.md in data_cleansing-0.6.0

@@ -50,11 +50,11 @@
 ### Ruby Example
 ```ruby
 require 'data_cleansing'
 
 # Define a global cleaner
-DataCleansing.register_cleaner(:strip) {|string| string.strip!}
+DataCleansing.register_cleaner(:strip) {|string| string.strip}
 
 class User
   include DataCleansing::Cleanse
 
   attr_accessor :first_name, :last_name
@@ -76,21 +76,21 @@
 
 ### Rails Example
 
 ```ruby
 # Define a global cleanser
-DataCleansing.register_cleaner(:strip) {|string| string.strip!}
+DataCleansing.register_cleaner(:strip) {|string| string.strip}
 
 # 'users' table has the following columns :first_name, :last_name, :address1, :address2
 class User < ActiveRecord::Base
   include DataCleansing::Cleanse
 
   # Use a global cleaner
   cleanse :first_name, :last_name, :cleaner => :strip
 
   # Define a once off cleaner
-  cleanse :address1, :address2, :cleaner => Proc.new {|string| string.strip!}
+  cleanse :address1, :address2, :cleaner => Proc.new {|string| string.strip}
 
   # Automatically cleanse data before validation
   before_validation :cleanse_attributes!
 end
 
@@ -106,23 +106,23 @@
 
 ```ruby
 require 'data_cleansing'
 
 # Define a global cleaners
-DataCleansing.register_cleaner(:strip) {|string| string.strip!}
-DataCleansing.register_cleaner(:upcase) {|string| string.upcase!}
+DataCleansing.register_cleaner(:strip) {|string| string.strip}
+DataCleansing.register_cleaner(:upcase) {|string| string.upcase}
 
 class User
   include DataCleansing::Cleanse
 
   attr_accessor :first_name, :last_name, :title, :address1, :address2, :gender
 
   # Use a global cleaner
   cleanse :first_name, :last_name, :cleaner => :strip
 
   # Define a once off cleaner
-  cleanse :address1, :address2, :cleaner => Proc.new {|string| string.strip!}
+  cleanse :address1, :address2, :cleaner => Proc.new {|string| string.strip}
 
   # Use multiple cleaners, and a custom block
   cleanse :title, :cleaner => [:strip, :upcase, Proc.new {|string| "#{string}." unless string.end_with?('.')}]
 
   # Change the cleansing rule based on the value of other attributes in that instance of user
@@ -173,10 +173,10 @@
    #   Set to :info to log only those fields which were nilled out
    #   Set to :warn or higher to disable logging of cleansing actions
    config.data_cleansing.logger.level = :info
 
    # Register any global cleaners
-   config.data_cleansing.register_cleaner(:strip) {|string| string.strip!}
+   config.data_cleansing.register_cleaner(:strip) {|string| string.strip}
 
   end
 end
 ```