Add instructions to install ICU

Since
ytti/oxidized-web@1d65a79
added charlock_holmes which requires ICU to be installed

README.md

@@ -78,7 +78,7 @@ Check out the [Oxidized TREX 2014 presentation](http://youtu.be/kBQ_CTUuqeU#t=3h
 Install all required packages and gems.
 
 ```shell
-apt-get install ruby ruby-dev libsqlite3-dev libssl-dev pkg-config cmake libssh2-1-dev
+apt-get install ruby ruby-dev libsqlite3-dev libssl-dev pkg-config cmake libssh2-1-dev libicu-dev
 gem install oxidized
 gem install oxidized-script oxidized-web # if you don't install oxidized-web, make sure you remove "rest" from your config
 ```
@@ -88,13 +88,13 @@ gem install oxidized-script oxidized-web # if you don't install oxidized-web, ma
 On CentOS 6 / RHEL 6, install Ruby 2.0 or greater (for Ruby 2.1.2 installation instructions see [Installing Ruby 2.1.2 using RVM](#installing-ruby-212-using-rvm)), then install Oxidized dependencies
 
 ```shell
-yum install cmake sqlite-devel openssl-devel libssh2-devel
+yum install cmake sqlite-devel openssl-devel libssh2-devel libicu-devel
 ```
 
 RHEL 7 / CentOS 7 will work out of the box with the following package list:
 
 ```shell
-yum install cmake sqlite-devel openssl-devel libssh2-devel ruby gcc ruby-devel
+yum install cmake sqlite-devel openssl-devel libssh2-devel ruby gcc ruby-devel libicu-devel
 ```
 
 Now let's install oxidized via Rubygems:

lib/oxidized/version.rb

@@ -1,6 +1,6 @@
 module Oxidized
   VERSION = '0.22.0'
-  VERSION_FULL = '0.22.0-295-g45ada82'
+  VERSION_FULL = '0.22.0'
   def self.version_set
     version_full = %x(git describe --tags).chop rescue ""
     version      = %x(git describe --tags --abbrev=0).chop rescue ""