v1.7.0: Remove deprecated plugins; Remove python2 declaration

.github/workflows/python-package.yml

@@ -9,36 +9,13 @@ on:
     branches: [ "master" ]
 
 jobs:
-  build-pre37:
-
-    runs-on: ubuntu-latest
-    strategy:
-      fail-fast: false
-      matrix:
-        python-version: ["2.7"]
-
-    steps:
-    - uses: actions/checkout@v3
-    - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v3
-      with:
-        python-version: ${{ matrix.python-version }}
-    - name: Install dependencies
-      run: |
-        python -m pip install --upgrade pip
-        if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
-        if [ -f requirements-t-pre37.txt ]; then pip install -r requirements-t-pre37.txt; fi
-    - name: Test with nosetests
-      run: |
-        ./scripts/testing.sh
-
   build:
 
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
+        python-version: ["3.4", "3.5", "3.6", "3.7", "3.8", "3.9", "3.10", "3.11", "3.12.0-rc.1"]
 
     steps:
     - uses: actions/checkout@v3

setup.py

@@ -1,6 +1,6 @@
 from setuptools import setup
 
-__version__ = "1.6.5"
+__version__ = "1.7.0"
 
 
 setup(
@@ -9,21 +9,19 @@
     url="https://github.com/caesar0301/treelib",
     author="Xiaming Chen",
     author_email="chenxm35@gmail.com",
-    description="A Python 2/3 implementation of tree structure.",
+    description="A Python implementation of tree structure.",
     long_description="""This is a simple tree data structure implementation in python.""",
     license="Apache License, Version 2.0",
     packages=["treelib"],
     keywords=["data structure", "tree", "tools"],
     install_requires=["six"],
     classifiers=[
-        "Development Status :: 4 - Beta",
+        "Development Status :: 5 - Production",
         "Environment :: Console",
         "Intended Audience :: Developers",
         "License :: OSI Approved :: Apache Software License",
         "Operating System :: OS Independent",
         "Programming Language :: Python",
-        "Programming Language :: Python :: 2",
-        "Programming Language :: Python :: 2.7",
         "Programming Language :: Python :: 3",
         "Programming Language :: Python :: 3.4",
         "Programming Language :: Python :: 3.5",