Correct incorrect project name in README

Michael Paquier · Michael Paquier · commit 7254d30cc9e1 · 2016-01-19T13:06:34.000+09:00
The upstream project is pg_rman.
diff --git a/README b/README
@@ -71,4 +71,4 @@ License
 
 pg_arman can be distributed under the PostgreSQL license. See COPYRIGHT
 file for more information. pg_arman is a fork of the existing project
-pg_arman, initially created and maintained by NTT and Itagaki Takahiro.
+pg_rman, initially created and maintained by NTT and Itagaki Takahiro.
