update contributing

CONTRIBUTING.rst

@@ -84,15 +84,15 @@ Ready to contribute? Here's how to set up `rioxarray` for local development.
 6. When you're done making changes, check that your changes pass flake8, are black formatter,
    and the tests pass::
 
-    $ flake8 rioxarray test
-    $ black --check .
-    $ python setup.py test or py.test
-
-   Or just run::
-
     $ make check
+    $ make test
+
+   Or, if you cannot run makefile commands::
 
-   To get flake8 and black, just pip install them into your virtualenv.
+    $ flake8 --ignore=E731,W503,W504 --exclude --max-complexity 10 --max-line-length 88 rioxarray/
+	$ flake8 --max-line-length 88 tests/unit/ tests/functional/ tests/integration
+	$ black --target-version py36 --check .
+    $ py.test
 
 7. Commit your changes and push your branch to GitLab::