doc: fixed the link to qa.openresty.org.

Signed-off-by: Yichun Zhang (agentzh) <agentzh@gmail.com>

Author: halfcrazy

README.markdown

@@ -946,7 +946,7 @@ To run specific test files:
 
 To run a specific test block in a particular test file, add the line `--- ONLY` to the test block you want to run, and then use the `prove` utility to run that `.t` file.
 
-There are also various testing modes based on mockeagain, valgrind, and etc. Refer to the [Test::Nginx documentation](http://search.cpan.org/perldoc?Test::Nginx) for more details for various advanced testing modes. See also the test reports for the Nginx test cluster running on Amazon EC2: <http://qa.openresty.org.>
+There are also various testing modes based on mockeagain, valgrind, and etc. Refer to the [Test::Nginx documentation](http://search.cpan.org/perldoc?Test::Nginx) for more details for various advanced testing modes. See also the test reports for the Nginx test cluster running on Amazon EC2: <http://qa.openresty.org>.
 
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