Fixed typo in requirements.

Signed-off-by: Daniel Scheffler <danschef@gfz-potsdam.de>

setup.py

@@ -63,7 +63,7 @@ req = [
 
 req_setup = ['setuptools-git']  # needed for package_data version-controlled by GIT
 
-req_test = ['pytest', 'pytest-cov', 'pytest-reporter-hmtl1', 'urlchecker']
+req_test = ['pytest', 'pytest-cov', 'pytest-reporter-html1', 'urlchecker']
 
 req_doc = ['sphinx-argparse', 'sphinx_rtd_theme', 'sphinx-autodoc-typehints']