README.md in iruby-0.2.9 vs README.md in iruby-0.3

@@ -10,38 +10,30 @@
 The installation instructions are divided according to environments mainly because of ZeroMQ.
 
 #### Ubuntu/Debian
 At first install IPython/Jupyter. I recommend an installation using virtualenv.
 
-    apt-get install python3-dev virtualenv libzmq3-dev
+    sudo apt-get install python3-dev python-virtualenv
     virtualenv -p python3 venv
     source venv/bin/activate
     pip install 'ipython[notebook]'
 
 After that, install the Ruby gem.
 
-    gem install rbczmq
+    gem install cztop
     gem install iruby
 
 Now you can run iruby with:
 
     iruby notebook
 
 #### Windows
 At first install IPython/Jupyter. I recommend an installation using [Enthought Canopy](https://www.enthought.com/).
 
-Please update your PATH to include build tools or download the DevKit from http://rubyinstaller.org/downloads and follow [this instructions](http://github.com/oneclick/rubyinstaller/wiki/Development-Kit).
-
-After that install ZeroMQ Legacy Stable Release 3.2.4 [x86 build for Windows XP SP3 and newer](http://miru.hk/archive/ZeroMQ-3.2.4~miru1.0-x86.exe).
-
-Rename `libzmq-v100-mt-3_2_4.dll` to `libzmq.dll`.
-
-Add the dll path to the PATH system variable.
-
 Run two commands below:
 
-    gem install ffi-rzmq
+    gem install cztop
     gem install iruby
 
 Now you can run iruby with:
 
     iruby notebook
@@ -50,11 +42,11 @@
 I recommend an installation using [Anaconda](https://store.continuum.io/cshop/anaconda/).
 
 After that, run three commands shown below.
 
     brew install libtool autoconf automake autogen
-    gem install rbczmq
+    gem install cztop
     gem install iruby
 
 #### FreeBSD
 
 At first install IPython/Jupyter. 
@@ -97,12 +89,11 @@
 
 Since jRuby is fully compatible with Ruby version 2.2, it is possible to use iruby with jRuby. 
 It can be helpful if you want to use java classes in your iruby notebook.
 This will require the following software:
 * jRuby version >= 9.0.4.0
-* ZeroMQ version >= 4.1.4 (You may have to build it from source.)
-* ffi-rzmq gem
+* cztop gem
 * this iruby gem
 
 After installation, make sure that your `env` is set up to jruby.
 ```shell
 $ env ruby -v
@@ -124,10 +115,12 @@
 ### Required dependencies
 
 * IPython/Jupyter >= 3.0.0
 * Ruby >= 2.1.0
 
-If you install IRuby with ffi-rzmq instead of rbczmq, libzmq >= 3.2 is added to the list above.
+If you install IRuby with CZTop, CZMQ >= 4.0.0 is added to the list above.
+
+If you install IRuby with ffi-rzmq, libzmq >= 3.2 is added to the list above.
 
 ### Authors
 
 See the [CONTRIBUTORS](CONTRIBUTORS) file.