second fix license link

Author: krasoffski

README.rst

@@ -87,6 +87,6 @@ To run test with Report Portal you need to specify neme of :code:`launch`:
 Copyright Notice
 ----------------
 
-Licensed under the GPLv3 license (see the LICENSE file).
+Licensed under the GPLv3_ license (see the LICENSE file).
 
-.. GPLv3:  https://www.gnu.org/licenses/quick-guide-gplv3.html
+.. _GPLv3:  https://www.gnu.org/licenses/quick-guide-gplv3.html