modify setup.cfg

.flake8

-[flake8]
-ignore = E265, E501

setup.cfg

@@ -25,9 +25,12 @@ classifiers =
 [options]
 packages = find:
 python_requires = >=3.6
-install_requires =
+setup_requires =
+    setuptools
     numpy
+install_requires =
     setuptools
+    numpy
     h5py>=3.1
     Pint
     ewoksorange @ git+https://gitlab.esrf.fr/workflow/ewoks/ewoksorange@main
@@ -74,9 +77,6 @@ dev =
     black
     flake8
 
-setup_requires =
-    setuptools
-    numpy
 # E501 (line too long) ignored for now
 # E203 and W503 incompatible with black formatting (https://black.readthedocs.io/en/stable/compatible_configs.html#flake8)
 [flake8]