Enable interpolations of booleans in config files.

We have to check for boolean before int, because int is also
a valid boolean.

diceware/config.py

@@ -73,7 +73,10 @@ def get_config_dict(path_list=None):
     conf = dict(parser.items('diceware'))
     for key, val in OPTIONS_DEFAULTS.items():
         new_val = conf.get(key, val)
-        if isinstance(val, int):
+        if isinstance(val, bool):
+            if not isinstance(new_val, bool):
+                new_val = parser.getboolean("diceware", key)
+        elif isinstance(val, int):
             new_val = int(new_val)
         result[key] = new_val
     return result

tests/test_config.py

@@ -67,3 +67,11 @@ class TestConfigModule(object):
         conf_dict = get_config_dict()
         assert "num" in conf_dict.keys()
         assert conf_dict["num"] == 3
+
+    def test_get_config_dict_bool(self, home_dir):
+        # booleabn values are interpolated correctly
+        config_file = home_dir / ".diceware.ini"
+        config_file.write("\n".join(["[diceware]", "caps = Off", ""]))
+        conf_dict = get_config_dict()
+        assert "caps" in conf_dict.keys()
+        assert conf_dict["caps"] is False