Update README.md

README.md

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 ## Installation and Usage
 
- 1. Download NUnit **2.6.3** from [official site](http://www.nunit.org/);
- 2. Download latest release from [allure-nunit releases](https://github.com/allure-framework/allure-nunit/releases);
+ 1. Download NUnit **2.6.3** or **2.6.4** from [official site](http://www.nunit.org/);
+ 2. Download latest release from [allure-nunit releases](https://github.com/allure-framework/allure-nunit/releases) for corresponding version (version specified in parentheses);
  3. Unpack binaries to **%NUnit_installation_directory%\bin\addins**;
  4. **NOTE:** addin will NOT be visible in **Tools -> Addins..** because it's built against **.NET 4.0**;
  5. In **%NUnit_installation_directory%\bin\addins\config.xml** specify ABSOLUTE path to any folder (this folder will be created automatically) where **xml** files will be generated (e.g. **<results-path>C:\test-results\AllureResults</results-path>** or **<results-path>/home/user/test-results/AllureResults</results-path>**);