README.md in winevt_c-0.4.4 vs README.md in winevt_c-0.4.5

- old
+ new
@@ -1,23 +1,29 @@
 # winevt_c
 
 [![Build status](https://ci.appveyor.com/api/projects/status/hr3phv8ihvgc68oj/branch/master?svg=true)](https://ci.appveyor.com/project/cosmo0920/winevt-c/branch/master)
 
+## Prerequisites
+
+* Windows Vista/Windows Server 2008 or later.
+* gcc and g++ from MSYS2 for building C/C++ extension.
+* Ruby 2.4 or later with MSYS2.
+
 ## Installation
 
 Add this line to your application's Gemfile:
 
 ```ruby
 gem 'winevt_c'
 ```
 
 And then execute:
 
-    $ bundle
+    $ ridk exec bundle
 
 Or install it yourself as:
 
-    $ gem install winevt_c
+    $ ridk exec gem install winevt_c
 
 ## Usage
 
 Usage examples are found in [example directory](example).
 ## Development