Merge pull request #523 from larrybradley/setup

Update tox config

tox.ini

@@ -58,7 +58,7 @@ description =
 
 # The following provides some specific pinnings for key packages
 deps =
-    cov: coverage
+    cov: pytest-cov
 
     numpy118: numpy==1.18.*
     numpy119: numpy==1.19.*
@@ -101,11 +101,10 @@ extras =
     build_docs: docs
 
 commands =
-    devdeps: pip install -U -i https://pypi.anaconda.org/astropy/simple astropy --pre
     pip freeze
-    !cov: pytest --pyargs regions {toxinidir}/docs {posargs}
-    cov: pytest --pyargs regions {toxinidir}/docs --cov regions --cov-config={toxinidir}/pyproject.toml {posargs}
-    cov: coverage xml -o {toxinidir}/coverage.xml
+    pytest --pyargs regions {toxinidir}/docs \
+    cov: --cov regions --cov-config={toxinidir}/pyproject.toml --cov-report xml:{toxinidir}coverage xml \
+    {posargs}
 
 [testenv:build_docs]
 changedir = docs