lint.sh: vermin -vvv instead of -vvvv (#1556)

My previous commit to this had a typo and used -vvvv instead of -vvv.

The -vvvv is imho a little bit too verbose and we should rather use -vvv only.

lint.sh

@@ -56,7 +56,7 @@ else
 fi
 
 # Checking minimum python version
-vermin -vvvv --no-tips -q -t=3.6 --violations ./pwndbg/
+vermin -vvv --no-tips -q -t=3.6 --violations ./pwndbg/
 
 flake8 --show-source ${LINT_FILES}