Update ruby versions to 2.2.7 and 2.3.4 in TravisCI
Update ruby versions to 2.2.7 and 2.3.4 in TravisCI


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