Fix type for BG96 (#77)

Author: rbalik

Hologram/Network/Modem/BG96.py

@@ -186,4 +186,4 @@ def _set_up_pdp_context(self):
 
     @property
     def description(self):
-        return 'Quecetel BG96'
+        return 'Quectel BG96'