remove version pins from robotframework packages

base.cfg

@@ -13,22 +13,8 @@ plone.formwidget.geolocation = >=2.2.0
 plone.patternslib = >=1.1.0
 plone.app.standardtiles = >= 2.4.0
 plone.batching = >=1.1.7
-
-# plone.app.standardtiles = 2.3.1 # fix https://github.com/plone/plone.app.standardtiles/issues/111
 pycodestyle =
 
-# Robot Testing (see buildout.coredev[5.2]/versions.cfg)
-plone.app.robotframework = 1.5.4
-robotframework = 3.1.2
-robotframework-python3 = 2.9
-robotframework-debuglibrary = 1.2.1
-robotframework-ride = 1.7.4.1
-robotframework-seleniumlibrary = 3.3.1
-robotframework-selenium2library = 3.0.0
-robotframework-selenium2screenshots = 0.8.1
-robotsuite = 2.2.1
-selenium = 3.141.0
-
 [versions:python27]
 # to get codeanalysis working
 build = 0.1