Test both versions of diff-lcs

Author: JonRowe

.travis.yml

@@ -38,6 +38,8 @@ matrix:
   include:
     - rvm: jruby-1.7
       env: JRUBY_OPTS='--dev --1.8'
+    - rvm: 2.7.1
+      env: DIFF_LCS_VERSION="~> 1.3.0"
   allow_failures:
     - rvm: jruby-head
     - rvm: ruby-head

Gemfile

@@ -20,6 +20,12 @@ else
   gem 'rake', '> 12.3.2'
 end
 
+if ENV['DIFF_LCS_VERSION']
+  gem 'diff-lcs', ENV['DIFF_LCS_VERSION']
+else
+  gem 'diff-lcs', '~> 1.4', '>= 1.4.3'
+end
+
 gem 'yard', '~> 0.9.24', :require => false
 
 ### deps for rdoc.info