Fix readme with correct build command

Signed-off-by: Chengwei Yang <yangchengwei@qiyi.com>

README.md

@@ -1,6 +1,6 @@
 # Mesos Debian packaging
 
-Build scripts to create a Mesos Debian package with [FPM](https://github.com/jordansissel/fpm) for simple installation in a cluster. 
+Build scripts to create a Mesos Debian package with [FPM](https://github.com/jordansissel/fpm) for simple installation in a cluster.
 
 Mesos is a cluster manager that provides efficient resource isolation and sharing across distributed applications, or frameworks. It can run Hadoop, MPI, Hypertable, Spark (a new framework for low-latency interactive and iterative jobs), and other applications. Currently is in the Apache Incubator and going through rapid development, though stable enough for a production usage. See [Mesos website](http://incubator.apache.org/mesos/) for more details.
 
@@ -27,9 +27,9 @@ define in e.g. `~/.bash_profile` a `MAINTAINER` variable
 
 	export MAKEFLAGS=-j8
 
-## Building deb package
+## Building deb or rpm package
 
-	./build_mesos wheezy
+	./build_mesos
 
 ## TODO