replace version in usage doc

VERSION

@@ -1 +1 @@
-0.2.9
+0.2.10

docs/default.nix

@@ -125,6 +125,11 @@ in stdenv.mkDerivation {
         '@VERSION@' \
         ${builtins.readFile ../VERSION}
 
+    substituteInPlace ./usage.md \
+      --replace \
+        '@VERSION@' \
+        ${builtins.readFile ../VERSION}
+
     substituteInPlace ./options.md \
       --replace \
         '@OPTIONS_JSON@' \

docs/usage.md

@@ -63,7 +63,7 @@ guarantee Self Host Block won't use a non-existing option from `nixpkgs`.
 To pin Self Host Blocks to a release/tag, run the following snippet:
 
 ```nix
-nix flake lock --override-input selfhostblocks github:ibizaman/selfhostblocks/v0.2.2
+nix flake lock --override-input selfhostblocks github:ibizaman/selfhostblocks/@VERSION@
 ```
 
 Updating Self Host Blocks to a new version can be done the same way.