Add SeleniumTestability to the list of known Libraries

Author: HelioGuilherme66

src/robotide/preferences/settings.cfg

@@ -172,6 +172,9 @@ documentation = 'https://marketsquare.github.io/robotframework-requests/doc/Requ
 [[[SeleniumLibrary]]]
 command = ['%executable -m pip install -U robotframework-seleniumlibrary']
 documentation = 'https://robotframework.org/SeleniumLibrary/SeleniumLibrary.html'
+[[[SeleniumTestability]]]
+documentation = 'https://marketsquare.github.io/robotframework-seleniumtestability/index.html'
+command = ['%executable -m pip install -U robotframework-seleniumtestability']
 [[[SikuliLibrary]]]
 command = ['%executable -m pip install -U robotframework-sikuliLibrary']
 documentation = 'https://marketsquare.github.io/robotframework-SikuliLibrary/docs/SikuliLibrary.html'