Bump sanitize-html from 1.18.3 to 1.18.4

Bumps [sanitize-html](https://github.com/punkave/sanitize-html) from 1.18.3 to 1.18.4.
- [Release notes](https://github.com/punkave/sanitize-html/releases)
- [Commits](apostrophecms/sanitize-html@1.18.3...1.18.4)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Author: dependabot-support

package.json

@@ -98,7 +98,7 @@
     "raven": "~2.6.1",
     "request": "~2.87.0",
     "request-promise": "~4.2.2",
-    "sanitize-html": "^1.18.3",
+    "sanitize-html": "^1.18.4",
     "serve-favicon": "~2.5.0",
     "shortid": "~2.2.12",
     "slug": "~0.9.1",

yarn.lock

@@ -6244,9 +6244,9 @@ safe-regex@^1.1.0:
   version "2.1.2"
   resolved "https://registry.yarnpkg.com/safer-buffer/-/safer-buffer-2.1.2.tgz#44fa161b0187b9549dd84bb91802f9bd8385cd6a"
 
-sanitize-html@^1.18.3:
-  version "1.18.3"
-  resolved "https://registry.yarnpkg.com/sanitize-html/-/sanitize-html-1.18.3.tgz#d190ecfcdf8c78bd2306c5f370c86b705191e00c"
+sanitize-html@^1.18.4:
+  version "1.18.4"
+  resolved "https://registry.yarnpkg.com/sanitize-html/-/sanitize-html-1.18.4.tgz#ffdeea13b555dd5e872e9a68b79e5e716cd8c543"
   dependencies:
     chalk "^2.3.0"
     htmlparser2 "^3.9.0"