Deploy typo and doc update.

.circleci/config.yml

@@ -3,7 +3,7 @@ jobs:
   build:
     working_directory: ~/leiningen
     docker:
-      - image: clojure:lein-2.7.1
+      - image: clojure:lein-2.8.1
     steps:
       - checkout
       - restore_cache:

doc/DEPLOY.md

@@ -324,6 +324,13 @@ libraries using Leiningen. Applications will have different requirements
 that are varied enough that Leiningen doesn't attempt to support them
 out of the box.
 
+If you just want to change the `deploy` step so it goes to Clojars, you don't
+have to replace the whole `:release-tasks` vector, just set this:
+
+```clojure
+:deploy-repositories {"releases" {:url "https://repo.clojars.org" :creds :gpg}}
+```
+
 ### Committing
 
 By default, `["vcs" "commit"]` will commit with the message `"Version