ruby 2.1.6

https://www.ruby-lang.org/en/news/2015/04/13/ruby-2-1-6-released/

.ruby-version

-2.1.5
+2.1.6

doc/install/installation.md

@@ -103,8 +103,8 @@ Remove the old Ruby 1.8 if present
 Download Ruby and compile it:
 
     mkdir /tmp/ruby && cd /tmp/ruby
-    curl -L --progress http://cache.ruby-lang.org/pub/ruby/2.1/ruby-2.1.5.tar.gz | tar xz
-    cd ruby-2.1.5
+    curl -L --progress http://cache.ruby-lang.org/pub/ruby/2.1/ruby-2.1.6.tar.gz | tar xz
+    cd ruby-2.1.6
     ./configure --disable-install-rdoc
     make
     sudo make install

doc/update/6.x-or-7.x-to-7.9.md

@@ -35,7 +35,7 @@ You can check which version you are running with `ruby -v`.
 
 If you are you running Ruby 2.0.x, you do not need to upgrade ruby, but can consider doing so for performance reasons.
 
-If you are running Ruby 2.1.1 consider upgrading to 2.1.5, because of the high memory usage of Ruby 2.1.1.
+If you are running Ruby 2.1.1 consider upgrading to 2.1.6, because of the high memory usage of Ruby 2.1.1.
 
 Install, update dependencies:
 
@@ -47,8 +47,8 @@ Download and compile Ruby:
 
 ```bash
 mkdir /tmp/ruby && cd /tmp/ruby
-curl --progress http://cache.ruby-lang.org/pub/ruby/2.1/ruby-2.1.5.tar.gz | tar xz
-cd ruby-2.1.5
+curl --progress http://cache.ruby-lang.org/pub/ruby/2.1/ruby-2.1.6.tar.gz | tar xz
+cd ruby-2.1.6
 ./configure --disable-install-rdoc
 make
 sudo make install