raise when handle's labels contains only tld or nothing

Changed files
+3
src
atpasser
handle
+3
src/atpasser/handle/__init__.py
···
labels = handle.lower().split(".")
+
if len(labels) < 2:
+
raise ValueError("are you tld?")
+
if labels[0] == "" or labels[-1] == "":
raise ValueError("proceeding or tariling ascii periods")