fix: python2 install failed

Author: MyColorfulDays

setup.py

@@ -13,11 +13,11 @@
 
 setup(
     name='jsonformatter',
-    version='0.2.0',
+    version='0.2.1',
     description=(
         'Python log in json format.'
     ),
-    long_description=open('README.md', encoding='utf-8').read(),
+    long_description=open('README.md').read(),
     long_description_content_type="text/markdown",
     platforms=["all"],
     classifiers=[