Merge branch 'patch-1' into 'master'

Updated doctest's output to reflect error message found in summer 2019.

See merge request !1

examples.py

@@ -11,7 +11,7 @@ def parse(pair):
     >>> parse('invalid')
     Traceback (most recent call last):
       ...
-    ValueError: need more than 1 value to unpack
+    ValueError: not enough values to unpack (expected 2, got 1)
 
     Likewise if there is more than one separator:
     >>> parse('first: second: third')