setup.py: re-add accidentally removed dependency on setuptools_scm

.travis.yml

@@ -62,8 +62,6 @@ install:
     pipenv install --selective-upgrade "pandas==$PANDAS_VERSION";
   fi
 - pipenv graph
-- cat "$(pipenv --venv)"/lib/python*/site-packages/freesurfer-volume-reader.egg-link
-- (set -x; ls -la $TRAVIS_BUILD_DIR/freesurfer_volume_reader/)
 
 script:
 - pipenv run pylint freesurfer_volume_reader tests/*

setup.py

@@ -50,6 +50,7 @@ setuptools.setup(
         # >=0.21.0 pandas.DataFrame.drop(columns=[...], ...)
         "pandas>=0.21.0,<2"
     ],
+    setup_requires=["setuptools_scm"],
     tests_require=[
         'pylint>=2.3.0,<3',
         'pytest<5',