Add circleci config.yml.

.circleci/config.yml

@@ -0,0 +1,20 @@
+version: 2
+jobs:
+  build:
+    working_directory: ~/leiningen
+    docker:
+      - image: clojure:lein-2.7.1
+    steps:
+      - checkout
+      - restore_cache:
+          key: << checksum "project.clj" >>
+      - run:
+          working_directory: ~/leiningen/leiningen-core
+          command: lein bootstrap
+      - run: bin/lein test
+      - save_cache:
+          paths:
+            - $HOME/.m2
+            - $HOME/.lein
+          key: << checksum "project.clj" >>
+

.gitignore

@@ -24,3 +24,4 @@
 TAGS
 test_projects/*/target
 pom.xml
+deps.txt

CONTRIBUTING.md

@@ -57,10 +57,7 @@ tasks. Assuming you are in Leiningen's project root, you can do that like this:
 
 ```bash
 $ cd leiningen-core
-$ lein bootstrap
-$ cd ..
-$ bin/lein compile
-## or the bat file on Windows.
+$ lein bootstrap # or lein.bat on Windows.
 ```
 
 The `lein` command is a stable release of Leiningen on your `$PATH` – preferably