Fix issue with the -s argument.

Author: funilrys

.travis.yml

@@ -100,6 +100,7 @@ script:
   - coverage run setup.py test
   - coverage xml
   - domain2idna -d аррӏе.com
+  - domain2idna -s аррӏе.com google.com
   - domain2idna -f .travis/list_of_domain
   - domain2idna -f .travis/list_of_domain -o list_of_domain_converted
   - cat list_of_domain_converted

domain2idna/__init__.py

@@ -49,7 +49,7 @@
 
 from .converter import Converter
 
-VERSION = "1.10.0"
+VERSION = "1.10.1"
 
 
 def domain2idna(subject, encoding="utf-8"):

domain2idna/cli.py

@@ -139,7 +139,7 @@ def tool():  # pragma: no cover
         parser.add_argument(
             "-s",
             "--subject",
-            type=list,
+            type=str,
             nargs="+",
             help="Sets the subjects to convert.",
             default=[]