Teach it about isort in addition to black

The design of this is starting to break down now and will need to be reworked
a bit.

would-reformat.sh

@@ -28,11 +28,20 @@ if [[ $file_type = "javascript" || \
     would_reformat_retval=1
     syntax_error_retval=2
 elif [[ $file_type == "python" ]]; then
-    out=$(pipx run black --check $file 2>/dev/null)
-    retval="$?"
+
+    out=$(pipx run isort --check $file 2>/dev/null)
+    isort_retval="$?"
+
     success_retval=0
     would_reformat_retval=1
     syntax_error_retval=123
+
+    if [[ x"$isort_retval" = x"0" ]] ; then
+        out=$(pipx run black --check $file 2>/dev/null)
+        retval="$?"
+    else
+        retval="$isort_retval"
+    fi
 else
     echo -n "ignoring"
     exit 0