Add xmlschema dependency. #61

Author: tonybaloney

.github/workflows/ci.yml

@@ -33,8 +33,8 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        python -m pip install flake8 pytest==${{ matrix.pytest-version }} xmlschema==1.0.13
-        python -m pip install -e .
+        python -m pip install flake8 pytest==${{ matrix.pytest-version }}
+        python -m pip install -e .[dev]
     - name: Test with pytest
       run: |
         pytest

setup.py

@@ -35,6 +35,10 @@ def getversion():
     install_requires=['pytest>=4.6.0', 'attrs'],
     extras_require={
         ':python_version=="2.7"': ['enum34>=1.1.6'],
+        'dev': [
+            'xmlschema==1.0.13',
+            'pytest',
+        ],
     },
     classifiers=[
         'Development Status :: 4 - Beta',