.travis.yml in rack-when-0.0.4 vs .travis.yml in rack-when-1.0.0

@@ -1,17 +1,8 @@
-# In order to install old Rubies, we need to use old Ubuntu distibution.
-dist: trusty
 language: ruby
 before_install: gem update bundler
 rvm:
   - 2.7.1
   - 2.6.6
   - 2.5.8
   - 2.4.10
   - 2.3.8
-  - 2.3.1
-  - 2.2
-  - 2.1
-  - 2.0
-  - 1.9.3
-  - 1.9.2
-  - jruby-19mode