fixed issues in https://www.pullreview.com/github/alaghu/Algorithms/reviews/master?file=features/1_1_28_binary_search_spec.rb
fixed double quaote vs single quote violation https://www.pullreview.com/github/alaghu/Algorithms/reviews/pull_review#collapse481209.
fixed double quaote vs single quote violation https://www.pullreview.com/github/alaghu/Algorithms/reviews/pull_review#collapse481970.