Fix typo and add change log entry

Author: hamishmack

changelog.md

@@ -1,6 +1,10 @@
 This file contains a summary of changes to Haskell.nix and `nix-tools`
 that will impact users.
 
+## Jan 25, 2021
+* Removed older versions of haskell-language-server from custom-tools
+  (0.8.0 is in hackage so we can still get that version).
+
 ## Jan 14, 2021
 * Added support for cross package refs (with a project).  Relative
   directory references between packages within a project should now

overlays/tools.nix

@@ -97,7 +97,7 @@ in { haskell-nix = prev.haskell-nix // {
   # sure they are cached.
   custom-tools = {
     # Currently everything we want is in hackage.
-    # Before addy anything here consider uploading to hackage instead.
+    # Before adding anything here consider uploading to hackage instead.
     # If that is not possible look at the git history of this file to see examples
     # of how to add a custom-tool.
   };