fix(package): update @adobe/parcel-plugin-htl to version 2.1.8

Author: greenkeeper[bot]

package-lock.json

@@ -38,7 +38,7 @@
     "@adobe/helix-pipeline": "^1.5.0",
     "@adobe/helix-shared": "1.2.0",
     "@adobe/helix-simulator": "2.12.6",
-    "@adobe/parcel-plugin-htl": "2.1.7",
+    "@adobe/parcel-plugin-htl": "2.1.8",
     "@babel/core": "^7.4.3",
     "@parcel/logger": "1.11.0",
     "@snyk/nodejs-runtime-agent": "1.44.0",