Introduced --retries flag, made thorough refactoring

- updated sites list
- test scripts linting

lint.sh

@@ -1,5 +1,5 @@
 #!/bin/sh
-FILES="maigret wizard.py maigret.py"
+FILES="maigret wizard.py maigret.py tests"
 
 echo 'syntax errors or undefined names'
 flake8 --count --select=E9,F63,F7,F82 --show-source --statistics $FILES
@@ -8,4 +8,4 @@ echo 'warning'
 flake8 --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics --ignore=E731,W503 $FILES
 
 echo 'mypy'
-mypy ./maigret
+mypy ./maigret ./wizard.py ./tests