Add matrix gem.

Author: shorowit

Gemfile

@@ -4,6 +4,7 @@ source 'http://rubygems.org'
 
 gem 'oga'
 gem 'rake'
+gem 'matrix'
 gem 'minitest', '5.15'
 gem 'minitest-reporters'
 gem 'msgpack'

Gemfile.lock

@@ -5,6 +5,7 @@ GEM
     ast (2.4.2)
     builder (3.2.4)
     docile (1.4.0)
+    matrix (0.4.2)
     minitest (5.15.0)
     minitest-reporters (1.5.0)
       ansi
@@ -34,6 +35,7 @@ PLATFORMS
   x64-mingw32
 
 DEPENDENCIES
+  matrix
   minitest (= 5.15)
   minitest-reporters
   msgpack