Add specific ruby versions so Travis CI downloads the right rvm binaries
Add specific ruby versions so Travis CI downloads the right rvm binaries

biow0lf/shoulda-matchers,guialbuk/shoulda-matchers,reacuna/shoulda-matchers,biow0lf/shoulda-matchers,reacuna/shoulda-matchers,thoughtbot/shoulda-matchers,guialbuk/shoulda-matchers,guialbuk/shoulda-matchers,biow0lf/shoulda-matchers,thoughtbot/shoulda-matchers,reacuna/shoulda-matchers,biow0lf/shoulda-matchers,thoughtbot/shoulda-matchers,thoughtbot/shoulda-matchers,reacuna/shoulda-matchers,guialbuk/shoulda-matchers