update jsonschema range

Author: Luiz Lobo

CHANGELOG.md

@@ -1,5 +1,8 @@
 # Changelog
 
+## 5.13.1
+  * Upgrade version of jsonschema [#161](https://github.com/singer-io/singer-python/pull/161)
+
 ## 5.13.0
   * Add support for dev mode argument parsing [#158](https://github.com/singer-io/singer-python/pull/158)
 

setup.py

@@ -4,14 +4,14 @@
 import subprocess
 
 setup(name="singer-python",
-      version='5.13.0',
+      version='5.13.1',
       description="Singer.io utility library",
       author="Stitch",
       classifiers=['Programming Language :: Python :: 3 :: Only'],
       url="http://singer.io",
       install_requires=[
           'pytz>=2018.4',
-          'jsonschema==2.6.0',
+          'jsonschema>=3.0,<4.0',
           'simplejson==3.11.1',
           'python-dateutil>=2.6.0',
           'backoff==1.8.0',