Merge pull request #56 from nolim1t/docs-0.21.1

Update Readme with 0.21.1 in the docs

README.md

@@ -64,6 +64,7 @@ This repo builds [`bitcoind`] in an [auditable way](https://github.com/lncm/dock
 
 > **NOTE:** For an always up-to-date list see: https://hub.docker.com/r/lncm/bitcoind/tags
 
+* `v0.21.1`
 * `v0.21.0`
 * `v0.20.0`
 * `v0.19.1`
@@ -81,7 +82,7 @@ This repo builds [`bitcoind`] in an [auditable way](https://github.com/lncm/dock
 First pull the image from [Docker Hub]:
 
 ```bash
-docker pull lncm/bitcoind:v0.21.0
+docker pull lncm/bitcoind:v0.21.1
 ```
 
 > **NOTE:** Running above will automatically choose native architecture of your CPU.
@@ -91,7 +92,7 @@ docker pull lncm/bitcoind:v0.21.0
 Or, to pull a specific CPU architecture:
 
 ```bash
-docker pull lncm/bitcoind:v0.21.0-arm64v8
+docker pull lncm/bitcoind:v0.21.1-arm64v8
 ```
 
 #### Start
@@ -112,7 +113,7 @@ docker run  -it  --rm  --detach \
     -p 28332:28332 \
     -p 28333:28333 \
     --name bitcoind \
-    lncm/bitcoind:v0.21.0
+    lncm/bitcoind:v0.21.1
 ```
 
 That will run bitcoind such that: