#260 change documented level for CIS-DI-0006 to be INFO (#261)

Author: BertelBB

README.md

@@ -277,7 +277,7 @@ $ docker run --rm goodwithtech/dockle:v${DOCKLE_LATEST} [YOUR_IMAGE_NAME]
 | [CIS-DI-0003](CHECKPOINT.md#cis-di-0003) | Do not install unnecessary packages in the container | FATAL
 | [CIS-DI-0004](CHECKPOINT.md#cis-di-0004) | Scan and rebuild the images to include security patches | FATAL
 | [CIS-DI-0005](CHECKPOINT.md#cis-di-0005) | Enable Content trust for Docker | INFO
-| [CIS-DI-0006](CHECKPOINT.md#cis-di-0006) | Add `HEALTHCHECK` instruction to the container image | WARN
+| [CIS-DI-0006](CHECKPOINT.md#cis-di-0006) | Add `HEALTHCHECK` instruction to the container image | INFO
 | [CIS-DI-0007](CHECKPOINT.md#cis-di-0007) | Do not use `update` instructions alone in the Dockerfile | FATAL
 | [CIS-DI-0008](CHECKPOINT.md#cis-di-0008) | Confirm safety of `setuid` and `setgid` files | INFO
 | [CIS-DI-0009](CHECKPOINT.md#cis-di-0009) | Use `COPY` instead of `ADD` in Dockerfile | FATAL