README.md in kaiser-ruby-0.4.2 vs README.md in kaiser-ruby-0.5

@@ -1,5 +1,8 @@
+[![Build Status](https://travis-ci.org/marcinruszkiewicz/kaiser-ruby.svg?branch=master)](https://travis-ci.org/marcinruszkiewicz/kaiser-ruby)
+[![Gem Version](https://badge.fury.io/rb/kaiser-ruby.svg)](https://badge.fury.io/rb/kaiser-ruby)
+
 # KaiserRuby - a Rockstar to Ruby transpiler
 
 This tool translates a file containing a program written in the [Rockstar language](https://github.com/dylanbeattie/rockstar) to Ruby code.
 
 This is still a work in progress, however most of the language implementation is already finished and working (as are the fibonacci sequence and fizzbuzz examples in the repository). For details on what is done, see the TODO.md and CHANGELOG.md files.
@@ -9,9 +12,13 @@
 Install the gem by issuing the following command.
 
 ```
 $ gem install kaiser-ruby
 ```
+
+This gem works best on a current Ruby version and requires Ruby 2.3 at minimum. Running it on 2.3 has the downside of metal umlauts not being entirely correct as that Ruby version doesn't know how to `.downcase` a capital umlaut letter, which was fixed in 2.4.
+
+If you're not using the umlauts, all should be fine otherwise.
 
 ## Usage
 
 The most common usage of this gem is to transpile (or transpile and run immediately) Rockstar code into Ruby code.