Fix example

examples/inspect_geom_class.py

@@ -4,5 +4,5 @@ from pycrystfel.bindings import Detector
 
 det = Detector.from_filename(sys.argv[1])
 print(f"{det.n_panels} panels:")
-for name in det.panel_names:
+for name in det.panel_names():
     print(f"- {name}")

pycrystfel/bindings.pyx

@@ -105,4 +105,4 @@ cdef class Detector:
         return self._ptr.n_panels if self._ptr is not NULL else 0
 
     def panel_names(self):
-        return [self._ptr.panels[i].name for i in range(self.n_panels)]
+        return [self._ptr.panels[i].name.decode('utf-8') for i in range(self.n_panels)]