Remove accountType from README.md

Juhyung Park · Juhyung Park · commit f47c903354c2 · 2018-08-24T11:11:32.000+09:00
diff --git a/README.md b/README.md
@@ -4,7 +4,7 @@ codechain-keystore-cli [![Build Status](https://travis-ci.org/CodeChain-io/codec
 A command line CodeChain key management tool
 
 ```sh
-  Usage: cckey [options] [accountType] [action]
+  Usage: cckey [options] [action]
 
   Options:
 
