Use flake8-isort plugin rather than isort

Simpler to use and has color output

mirage.pro

@@ -79,10 +79,7 @@ no-x11 {
 
 # Add `make test` command
 
-test.commands  = echo &&
-test.commands += flake8 src/backend &&
-test.commands += isort --check-only $$glob_filenames(*.py) &&
-test.commands += mypy --pretty src/backend
+test.commands = flake8 src/backend && mypy --pretty src/backend
 
 QMAKE_EXTRA_TARGETS += test
 

requirements-dev.txt

@@ -2,9 +2,9 @@ remote_pdb >= 2.0.0,  < 3
 pdbpp      >= 0.10.2, < 0.11
 pprintpp   >= 0.4.0,  < 0.5
 
-isort                 >= 5.6.4,  < 6
 mypy                  >= 0.790,  < 0.800
 flake8                >= 3.8.4,  < 4
+flake8-isort          >= 4.0.0,  < 5
 flake8-bugbear        >= 20.1.4, < 21
 flake8-commas         >= 2.0.0,  < 3
 flake8-comprehensions >= 3.3.0,  < 4