update README

Author: LD250

README.md

@@ -4,6 +4,9 @@
 [![Code Health](https://landscape.io/github/LD250/jenkins-cli-python/master/landscape.svg?style=flat)](https://landscape.io/github/LD250/jenkins-cli-python/master)
 [![Requirements Status](https://requires.io/github/LD250/jenkins-cli-python/requirements.svg?branch=master)](https://requires.io/github/LD250/jenkins-cli-python/requirements/?branch=master)
 
+**Based on**
+[python-jenkins](https://git.openstack.org/cgit/openstack/python-jenkins)
+
 # Install:
 ```bash
 git clone https://github.com/LD250/jenkins-cli-python.git
@@ -14,20 +17,12 @@ python setup.py install
 # Usage:
 
 ```bash
-jenkins [-h] [--host jenkins-url] [--username username]
-         [--password password]
-         {jobs,queue,building,start,info,set_branch,stop,console} ...
+jenkins [-h] [--host jenkins-url] [--username username] [--password password]
+         {jobs,queue,building,start,info,setbranch,stop,console} ...
 ```
 
 Server URL, Username and password may be specified either by the command line arguments or in configuration file **(.jenkins-cli)**. Command line arguments has the highest priority, after that the **.jenkins-cli** file from current folder is taking into account. If there is no.jenkins-cli file in current folder, settings will be read from **.jenkins-cli** from the home folder
 
-# Optional arguments:
-```bash
-  -h, --help            show this help message and exit
-  --host jenkins-url    Jenkins Server Url
-  --username username   Jenkins Username
-  --password password   Jenkins Password
-```
 
 # Available commands:
 ```bash
@@ -37,7 +32,7 @@ Server URL, Username and password may be specified either by the command line ar
     building            Build executor status
     start               Start job
     info                Job info
-    set_branch          Set SCM branch
+    setbranch           Set SCM branch
     stop                Stop job
     console             Show console for last build
 ```