Update README with link to nightly builds

README.md

 # HOW TO BUILD SAT4J FROM SOURCE
 
+> Nighlty builds are available [here](https://gitlab.ow2.org/sat4j/sat4j/pipelines)
 
 ## Using Maven (library users)
 
@@ -16,11 +17,6 @@ All the dependencies will be gathered by Maven.
 
 ## Using ant (solvers users)
 
-Download the missing libraries and put them in the lib directory:
-+ Apache commons CLI
-+ Apache commons UseBean
-+ Mozilla Rhino
-
 Just type:
 
 ```shell