pre-commit hook removes audited secrets

[domanchi]

Steps to Reproduce

$ detect-secrets scan test_data/short_files/first_line.py > .secrets.baseline
$ echo "delete the secret from test_data/short_files/first_line.py"
$ PYTHONPATH=`pwd` detect_secrets/pre_commit_hook.py --baseline .secrets.baseline test_data/short_files/first_line.py
$ git diff .secrets.baseline

[KevinHock]

s/"delete the secret from test_data/short_files/first_line.py"/"move the secret to a new line in test_data/short_files/first_line.py"/g

You'll see something like

   "exclude_regex": null,
-  "generated_at": "2018-07-31T17:55:15Z",
+  "generated_at": "2018-07-31T18:06:31Z",
   "plugins_used": [
     {
       "base64_limit": 4.5,
@@ -18,8 +18,7 @@
     "test_data/short_files/first_line.py": [
       {
         "hashed_secret": "4c8e08f94044d9b59913f66873af8eac4299266e",
-        "is_secret": true,
-        "line_number": 1,
+        "line_number": 2,