Fix CI (#200)

Author: SweetVishnya

.github/workflows/main.yml

@@ -18,8 +18,8 @@ jobs:
           wget https://bootstrap.pypa.io/pip/2.7/get-pip.py
           python2 get-pip.py
           rm get-pip.py
-          python2 -m pip install --upgrade setuptools wheel
-          python3 -m pip install --upgrade setuptools wheel
+          python2 -m pip install --upgrade setuptools wheel importlib_metadata
+          python3 -m pip install --upgrade setuptools wheel importlib_metadata
           python2 setup.py sdist bdist_wheel
           python3 setup.py sdist bdist_wheel
     - name: Install