Fix the matrix gem issue

Author: bankair

Gemfile

@@ -17,3 +17,5 @@ gem "flamegraph", "~> 0.9.5", :group => [:development]
 gem "stackprof", "~> 0.2.12", :group => [:development]
 
 gem "duck_enforcer", "~> 1.0"
+
+gem "matrix", "~> 0.4.2"

Gemfile.lock

@@ -25,6 +25,7 @@ GEM
     flamegraph (0.9.5)
     gherkin (5.1.0)
     highline (2.0.1)
+    matrix (0.4.2)
     multi_json (1.13.1)
     multi_test (0.1.2)
     options (2.3.2)
@@ -54,6 +55,7 @@ DEPENDENCIES
   cucumber (~> 3.1)
   duck_enforcer (~> 1.0)
   flamegraph (~> 0.9.5)
+  matrix (~> 0.4.2)
   progress_bar (~> 1.3)
   rspec (~> 3.8)
   stackprof (~> 0.2.12)