README.md in active_tax-0.3.0 vs README.md in active_tax-1.0.0

@@ -6,10 +6,10 @@
 
 ## Installation
 
 Add this line to your application's Gemfile:
 
-    gem 'active_tax'
+    gem 'active_tax', '~> 1.0.0'
 
 ## Usage
 
 ```ruby
 tax = ActiveTax::Tax.new({