Release minitest lock so we can fix the order dependent tests

Author: rafaelfranca

Gemfile

@@ -89,9 +89,6 @@ local_gemfile = File.dirname(__FILE__) + "/.Gemfile"
 instance_eval File.read local_gemfile if File.exist? local_gemfile
 
 group :test do
-  # FIX: Our test suite isn't ready to run in random order yet.
-  gem "minitest", "< 5.3.4"
-
   platforms :mri do
     gem "stackprof"
     gem "byebug"

Gemfile.lock

@@ -231,7 +231,7 @@ GEM
       mime-types-data (~> 3.2015)
     mime-types-data (3.2016.0521)
     mini_portile2 (2.1.0)
-    minitest (5.3.3)
+    minitest (5.9.0)
     mocha (0.14.0)
       metaclass (~> 0.0.1)
     mono_logger (1.1.0)
@@ -399,7 +399,6 @@ DEPENDENCIES
   kindlerb (~> 1.2.0)
   libxml-ruby
   listen (>= 3.0.5, < 3.2)
-  minitest (< 5.3.4)
   mocha (~> 0.14)
   mysql2 (>= 0.4.4)
   nokogiri (>= 1.6.8)