No self

src/org/moodle/ci/branches/Branch.groovy

@@ -20,13 +20,13 @@ class Branch {
     }
 
     def getHighestSupportedVersion() {
-        def versions = self.getPhpVersions()
+        def versions = getPhpVersions()
 
         return versions[versions.size() - 1]
     }
 
     def getLowestSupportedVersion(branch) {
-        def versions = self.getPhpVersions()
+        def versions = getPhpVersions()
 
         return versions[0]
     }