python: add missing bindings for randomize()

* python/spot/impl.i: Here.
* NEWS: Mention it.
* tests/python/highlighting.ipynb: Add test case.

NEWS

@@ -112,6 +112,8 @@ New in spot 2.0.3a (not yet released)
 
   * Bindings for language_containment_checker were added.
 
+  * Bindings for randomize() were added.
+
   * Under IPython the spot.ltsmin modules now offers a
     %%pml magic to define promela models, compile them
     with spins, and dynamically load them.   This is

python/spot/impl.i

@@ -128,6 +128,7 @@
 #include <spot/twaalgos/magic.hh>
 #include <spot/twaalgos/minimize.hh>
 #include <spot/twaalgos/neverclaim.hh>
+#include <spot/twaalgos/randomize.hh>
 #include <spot/twaalgos/remfin.hh>
 #include <spot/twaalgos/strength.hh>
 #include <spot/twaalgos/sccfilter.hh>
@@ -435,6 +436,7 @@ namespace std {
 %include <spot/twaalgos/magic.hh>
 %include <spot/twaalgos/minimize.hh>
 %include <spot/twaalgos/neverclaim.hh>
+%include <spot/twaalgos/randomize.hh>
 %include <spot/twaalgos/remfin.hh>
 %include <spot/twaalgos/strength.hh>
 %include <spot/twaalgos/sccfilter.hh>