Update image versions in README after release

0.1.21 -> 0.1.22

README.md

@@ -47,37 +47,37 @@ Webdis images are published on [Docker Hub](https://hub.docker.com/r/nicolas/web
 ### Docker Hub
 
 ```sh
-$ docker pull nicolas/webdis:0.1.21
+$ docker pull nicolas/webdis:0.1.22
 $ docker pull nicolas/webdis:latest
 ```
 Starting from release `0.1.12` and including `latest`, Docker Hub images are signed ([download public key](nicolasff.pub)). You should see the following key ID if you verify the trust:
 
 ```
-$ docker trust inspect nicolas/webdis:0.1.21 --pretty
+$ docker trust inspect nicolas/webdis:0.1.22 --pretty
 
-Signatures for nicolas/webdis:0.1.21
+Signatures for nicolas/webdis:0.1.22
 
 SIGNED TAG   DIGEST                                                             SIGNERS
-0.1.21       bea53be391b11fd8a33d55c5e3d49eb11c4c2f89e9e82ca70b3a91bc9c9aa208   (Repo Admin)
+0.1.22       5a7d342e3a9e5667fe05f045beae4b5042681d1d737f60843b7dfd11f96ab72f   (Repo Admin)
 
-List of signers and their keys for nicolas/webdis:0.1.21
+List of signers and their keys for nicolas/webdis:0.1.22
 
 SIGNER      KEYS
 nicolasff   dd0768b9d35d
 
-Administrative keys for nicolas/webdis:0.1.21
+Administrative keys for nicolas/webdis:0.1.22
 
   Repository Key:	fed0b56b8a8fd4d156fb2f47c2e8bd3eb61948b72a787c18e2fa3ea3233bba1a
   Root Key:	40be21f47831d593892370a8e3fc5bfffb16887c707bd81a6aed2088dc8f4bef
 ```
 
 The signing keys are listed on [this documentation page](docs/webdis-docker-content-trust.md#-key-ids); please make sure they match what you see.
-
+The same documentation page details how to [verify the signatures of multi-architecture images](docs/webdis-docker-content-trust.md), and the tree of manifests used to build them.
 
 ### Amazon Elastic Container Registry (ECR)
 
 ```sh
-$ docker pull public.ecr.aws/nicolas/webdis:0.1.21
+$ docker pull public.ecr.aws/nicolas/webdis:0.1.22
 $ docker pull public.ecr.aws/nicolas/webdis:latest
 ```