Bump Ruby version in some docs

.ruby-version.sample

@@ -1 +1 @@
-2.4.1
+2.4.4

README.md

@@ -26,7 +26,7 @@ Browse [lots more notable Discourse instances](https://www.discourse.org/custome
 
 2. If you're familiar with how Rails works and are comfortable setting up your own environment, use our [**Discourse Advanced Developer Guide**](docs/DEVELOPER-ADVANCED.md).
 
-Before you get started, ensure you have the following minimum versions: [Ruby 2.3+](http://www.ruby-lang.org/en/downloads/), [PostgreSQL 9.3+](http://www.postgresql.org/download/), [Redis 2.6+](http://redis.io/download). If you're having trouble, please see our [**TROUBLESHOOTING GUIDE**](docs/TROUBLESHOOTING.md) first!
+Before you get started, ensure you have the following minimum versions: [Ruby 2.4+](http://www.ruby-lang.org/en/downloads/), [PostgreSQL 9.3+](http://www.postgresql.org/download/), [Redis 2.6+](http://redis.io/download). If you're having trouble, please see our [**TROUBLESHOOTING GUIDE**](docs/TROUBLESHOOTING.md) first!
 
 ## Setting up Discourse
 

docs/DEVELOPMENT-OSX-NATIVE.md

@@ -4,7 +4,7 @@ These instructions assume you have read and understood the **[Discourse Advanced
 
 OS X has become a popular platform for developing Ruby on Rails applications; as such, if you run OS X, you might find it more congenial to work on **[Discourse](http://discourse.org)** in your native environment. These instructions should get you there.
 
-Obviously, if you **already** develop Ruby on OS X, a lot of this will be redundant, because you'll have already done it, or something like it. If that's the case, you may well be able to just install Ruby 2.3 using RVM and get started! Discourse has enough dependencies, however (note: not a criticism!) that there's a good chance you'll find **something** else in this document that's useful for getting your Discourse development started!
+Obviously, if you **already** develop Ruby on OS X, a lot of this will be redundant, because you'll have already done it, or something like it. If that's the case, you may well be able to just install Ruby 2.4+ using RVM and get started! Discourse has enough dependencies, however (note: not a criticism!) that there's a good chance you'll find **something** else in this document that's useful for getting your Discourse development started!
 
 ## Quick Setup
 
@@ -76,11 +76,11 @@ If you do already have RVM installed, this should make sure everything is up to
     # If autolibs is set to 0-2, it will give an error for things that are missing, instead.
     rvm requirements
 
-Either way, you'll now want to install the 'turbo' version of Ruby 2.0.
+Either way, you'll now want to install Ruby 2.4+ (we recommend 2.4.4 or higher).
 
     # Now, install Ruby
-    rvm install 2.3.4-turbo
+    rvm install 2.4.4
-    rvm use 2.3.4 --default # Careful with this if you're already developing Ruby
+    rvm use 2.4.4 --default # Careful with this if you're already developing Ruby
 
 ## Git
 

script/osx_dev

@@ -40,12 +40,12 @@ source ~/.rvm/scripts/rvm
 rvm get stable
 rvm autolibs homebrew # Tell RVM to install anything it's missing with homebrew
 rvm requirements # This will install baseline requirements that might be missing
-rvm install 2.0.0-turbo # Now, install Ruby 2.0.0 with performance patches
+rvm install 2.4.4 # Now, install Ruby 2.4.4
-rvm --create --ruby-version use 2.0.0-turbo # Use this Ruby as the default in this directory
+rvm --create --ruby-version use 2.4.4 # Use this Ruby as the default in this directory
 
 # Check that the correct version is installed and active
 echo "Checking Ruby installation..."
-ruby -v | grep 2.0.0
+ruby -v | grep 2.4.4
 
 ## Configure PostgreSQL (PostgreSQL was installed by Homebrew using `brew bundle`) ##
 echo "Loading PostgreSQL..."