diff --git a/.gitignore b/.gitignore
index f72f665..c519b0d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@
 *.swp
 build
 dist
+lunardate.egg-info/PKG-INFO
diff --git a/README.md b/README.md
index 68ff0a8..0cedeb7 100644
--- a/README.md
+++ b/README.md
@@ -75,6 +75,7 @@ pip install lunardate
 
 ## News
 
+* 0.3.0: drop python 2, add typing hints, rename identifiers to follow PEP 8
 * 0.2.2: add LunarDate.leapMonthForYear; fix bug in year 1899
 * 0.2.1: fix bug in year 1956
 * 0.2.0: extend year to 2099, thanks to @FuGangqiang
diff --git a/lunardate.egg-info/PKG-INFO b/lunardate.egg-info/PKG-INFO
deleted file mode 100644
index 09c28a6..0000000
--- a/lunardate.egg-info/PKG-INFO
+++ /dev/null
@@ -1,132 +0,0 @@
-Metadata-Version: 2.4
-Name: lunardate
-Version: 0.2.2
-Summary: A Chinese Calendar Library in Pure Python
-Home-page: https://github.com/lidaobing/python-lunardate
-Author: LI Daobing
-Author-email: lidaobing@gmail.com
-License: GPLv3
-Classifier: Development Status :: 4 - Beta
-Classifier: Programming Language :: Python :: 3
-Classifier: Programming Language :: Python :: 3.7
-Classifier: Programming Language :: Python :: 3.8
-Classifier: Programming Language :: Python :: 3.9
-Classifier: Programming Language :: Python :: 3.10
-Classifier: Programming Language :: Python :: 3.11
-Classifier: License :: OSI Approved :: GNU General Public License (GPL)
-Classifier: Operating System :: OS Independent
-Classifier: Topic :: Software Development :: Libraries :: Python Modules
-Requires-Python: >=3.7
-License-File: LICENSE.txt
-Dynamic: author
-Dynamic: author-email
-Dynamic: classifier
-Dynamic: description
-Dynamic: home-page
-Dynamic: license
-Dynamic: license-file
-Dynamic: requires-python
-Dynamic: summary
-
-
-A Chinese Calendar Library in Pure Python
-=========================================
-
-Chinese Calendar: http://en.wikipedia.org/wiki/Chinese_calendar
-
-Usage
------
-        >>> LunarDate.fromSolarDate(1976, 10, 1)
-        LunarDate(1976, 8, 8, 1)
-        >>> LunarDate(1976, 8, 8, 1).toSolarDate()
-        datetime.date(1976, 10, 1)
-        >>> LunarDate(1976, 8, 8, 1).year
-        1976
-        >>> LunarDate(1976, 8, 8, 1).month
-        8
-        >>> LunarDate(1976, 8, 8, 1).day
-        8
-        >>> LunarDate(1976, 8, 8, 1).isLeapMonth
-        True
-
-        >>> today = LunarDate.today()
-        >>> type(today).__name__
-        'LunarDate'
-
-        >>> # support '+' and '-' between datetime.date and datetime.timedelta
-        >>> ld = LunarDate(1976,8,8)
-        >>> sd = datetime.date(2008,1,1)
-        >>> td = datetime.timedelta(days=10)
-        >>> ld-ld
-        datetime.timedelta(0)
-        >>> (ld-sd).days
-        -11444
-        >>> ld-td
-        LunarDate(1976, 7, 27, 0)
-        >>> (sd-ld).days
-        11444
-        >>> ld+td
-        LunarDate(1976, 8, 18, 0)
-        >>> td+ld
-        LunarDate(1976, 8, 18, 0)
-        >>> ld2 = LunarDate.today()
-        >>> ld < ld2
-        True
-        >>> ld <= ld2
-        True
-        >>> ld > ld2
-        False
-        >>> ld >= ld2
-        False
-        >>> ld == ld2
-        False
-        >>> ld != ld2
-        True
-        >>> ld == ld
-        True
-        >>> LunarDate.today() == LunarDate.today()
-        True
-        >>> before_leap_month = LunarDate.fromSolarDate(2088, 5, 17)
-        >>> before_leap_month.year
-        2088
-        >>> before_leap_month.month
-        4
-        >>> before_leap_month.day
-        27
-        >>> before_leap_month.isLeapMonth
-        False
-        >>> leap_month = LunarDate.fromSolarDate(2088, 6, 17)
-        >>> leap_month.year
-        2088
-        >>> leap_month.month
-        4
-        >>> leap_month.day
-        28
-        >>> leap_month.isLeapMonth
-        True
-        >>> after_leap_month = LunarDate.fromSolarDate(2088, 7, 17)
-        >>> after_leap_month.year
-        2088
-        >>> after_leap_month.month
-        5
-        >>> after_leap_month.day
-        29
-        >>> after_leap_month.isLeapMonth
-        False
-
-        >>> LunarDate.leapMonthForYear(2023)
-        2
-        >>> LunarDate.leapMonthForYear(2022) # will return None
-
-Limits
-------
-
-this library can only deal with year from 1900 to 2099 (in chinese calendar).
-
-See also
---------
-
-* lunar: http://packages.qa.debian.org/l/lunar.html,
-  A converter written in C, this program is derived from it.
-* python-lunar: http://code.google.com/p/liblunar/
-  Another library written in C, including a python binding.
diff --git a/lunardate.py b/lunardate.py
index c79681a..0ed5540 100644
--- a/lunardate.py
+++ b/lunardate.py
@@ -116,7 +116,7 @@
 import warnings
 from typing import ClassVar, Iterator, Optional, Union, overload
 
-__version__ = "0.2.2"
+__version__ = "0.3.0"
 __all__ = ['LunarDate']
 
 class LunarDate:
diff --git a/setup.py b/setup.py
index d043b5a..d7f4ee8 100755
--- a/setup.py
+++ b/setup.py
@@ -12,7 +12,7 @@
       author = 'LI Daobing',
       author_email = 'lidaobing@gmail.com',
       url = 'https://github.com/lidaobing/python-lunardate',
-      license = 'GPLv3',
+      license = 'GPL-3.0-or-later',
       python_requires='>=3.7',
       classifiers = [
                      'Development Status :: 4 - Beta',
@@ -22,7 +22,6 @@
                      'Programming Language :: Python :: 3.9',
                      'Programming Language :: Python :: 3.10',
                      'Programming Language :: Python :: 3.11',
-                     'License :: OSI Approved :: GNU General Public License (GPL)',
                      'Operating System :: OS Independent',
                      'Topic :: Software Development :: Libraries :: Python Modules'
                      ]