Follow recommendations and try both diff-lcs version on 2.7.1

rspec/rspec-support@548624d

Author: benoittgt

travis/.travis.yml

@@ -38,6 +38,8 @@ matrix:
       env: JRUBY_OPTS='--dev --1.8'
     - rvm: 2.7.1
       env: DIFF_LCS_VERSION="~> 1.3.0"
+    - rvm: 2.7.1
+      env: DIFF_LCS_VERSION="1.4.3"
   allow_failures:
     - rvm: jruby-head
     - rvm: ruby-head