fix random_regular

Author: moesoha

.travis.yml

@@ -1,8 +1,9 @@
 language: python
 python:
   - "2.7"
-  - "3.5"
   - "3.6"
+  - "3.7"
+  - "3.8"
   - "pypy"
   - "pypy3"
 install: pip install tox-travis

cyaron/string.py

@@ -101,7 +101,7 @@ def random_paragraph(sentence_count_range, **kwargs):
     @staticmethod
     def random_regular(*args, **kwargs):
         pattern = args
-        limit_len = int(kwargs.get("limit", default="10"))
+        limit_len = int(kwargs.get("limit", "10"))
         if (limit_len <= 1): limit_len = 10
         if (list_like(args)):
             pattern = random.choice(args)