Update README.md

Author: sagikazarmark

README.md

@@ -2,10 +2,6 @@
 
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 **HTTP adapter integration tests.**
@@ -22,6 +18,8 @@ $ composer require php-http/adapter-integration-tests
 
 ## Usage
 
+This package should not be used on its own. It provides integration tests for HTTP Adapters.
+
 
 ## Testing