build: make package 3.0 only

Author: jankapunkt

meteor-legacy-coverage/package.js

@@ -22,7 +22,7 @@ const dependencies = {
 };
 
 Package.onUse(function (api) {
-  api.versionsFrom(['1.6.1', '2.3', '3.0']);
+  api.versionsFrom(['3.0']);
 
   api.use(['ecmascript', 'webapp']);
   api.use(['meteortesting:[email protected]']);