Pin minitest to 4.7.0.
Pin minitest to 4.7.0.

We're not compatible with 5.

xiangzhuyuan/resque,Shopify/resque,ejlangev/resque,resque/resque,Shopify/resque,stvp/resque,resque/resque,Shopify/resque,resque/resque,xiangzhuyuan/resque,coupa/resque,stvp/resque,CloudVLab/resque,coupa/resque,ejlangev/resque,CloudVLab/resque,stvp/resque,coupa/resque,CloudVLab/resque,xiangzhuyuan/resque