brother_ql.exceptions: easier notation and line spacings

brother_ql/exceptions.py

@@ -1,4 +1,12 @@
-class BrotherQLError(Exception): pass
+
-class BrotherQLUnsupportedCmd(BrotherQLError): pass
+class BrotherQLError(Exception):
-class BrotherQLUnknownModel(BrotherQLError): pass
+    pass
-class BrotherQLRasterError(BrotherQLError): pass
+
+class BrotherQLUnsupportedCmd(BrotherQLError):
+    pass
+
+class BrotherQLUnknownModel(BrotherQLError):
+    pass
+
+class BrotherQLRasterError(BrotherQLError):
+    pass