Remove Rubinius and diff-lcs build jobs

Author: pirj

ci/.travis.yml

@@ -12,22 +12,14 @@ before_install:
 bundler_args: "--binstubs --standalone --without documentation --path ../bundle"
 script: "script/run_build"
 rvm:
-  - rbx-3
   - jruby-9.1.7.0 # pin JRuby to this until travis/rvm can install later versions
   - jruby-head
 env:
   - JRUBY_OPTS='--dev'
   - RSPEC_CI='true'
 matrix:
-  include:
-    - 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
-    - rvm: rbx-3
   fast_finish: true
 branches:
   only: