Merge branch 'lock-file' into 'master'

README.md: fix

See merge request !22

README.md

@@ -28,10 +28,6 @@ This package set has the following policy.
   * xmonad
   * wai-app-static
   * warp
-* Tags will be of the form `unstable-<yyyy>-<mm>-<dd>-r<N>` where any
-  unversioned source is used.
-* Tags will be of the form `stable-<yyyy>-<mm>-<dd>-r<N>` where all
-stable sources are used.
 
 ## Updating the package set
 
@@ -41,11 +37,6 @@ The package set is generated from the `horizon.dhall` using the following comman
 nix run 'git+https://gitlab.horizon-haskell.net/haskell/horizon-gen-nix?ref=refs/tags/0.10.0'
 ```
 
-This will generate both the packages folder and the package set file. If you
-want to regenerate a particular package in the packages folder, delete that file
-from the packages folder. To regenerate the entire package set from scratch,
-delete the packages folder.
-
 If you need to do additional manual overrides to the nix code, such as
 `addPkgconfigDepends`, edit the `configuration.nix` overlay, which is applied
 afterwards.