add a test for what it looks like when you remove an import

tests/golden-results/removed-forbidden.sh.txt

@@ -0,0 +1,4 @@
+vendor/elm-spa-example/src/Article/Body.elm: removed forbidden import Html! (Run me with `update` to fix this.)
+
+It looks like you removed some forbidden imports. Good job! To update the config
+and remove this error, just run me with the `update` command!

tests/integration/removed-forbidden.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+
+elm-forbid-import add-root vendor/elm-spa-example
+elm-forbid-import forbid Html
+
+set +e
+MATCH="$(elm-forbid-import --format json check | jq '.[0]')"
+set -e
+
+elm-forbid-import update
+
+FILE="$(jq -r '.file' <<< "$MATCH")"
+cp "$FILE" "$FILE.bak"
+sed -i "$(jq '.position.row' <<< "$MATCH")d" "$FILE"
+
+if elm-forbid-import check; then
+  exit 1 # this check should exit 1
+fi
+
+mv "$FILE.bak" "$FILE"