use customary 2-space indent

Author: uvtc

README.md

@@ -268,11 +268,11 @@ pairwise constructs as found in e.g. `let` and `cond`.
  ```Clojure
  ;; good
  (ns examlpes.ns
-  (:require [clojure.zip :refer :all]))
+ (:require [clojure.zip :refer :all]))
 
  ;; bad
  (ns examlpes.ns
-  (:use [clojure.zip]))
+ (:use [clojure.zip]))
  ```
 
 * Avoid single-segment namespaces.