.travis.yml in rakuten_web_service-1.9.0 vs .travis.yml in rakuten_web_service-1.9.1

@@ -1,8 +1,7 @@
 language: ruby
 rvm:
-  - 2.2.9
   - 2.3.6
   - 2.4.3
   - 2.5.0
   - ruby-head
 
@@ -25,11 +24,9 @@
 
 matrix:
   allow_failures:
   - rvm: ruby-head
   exclude:
-  - rvm: 2.2.9
-    env: INTEGRATION=yes
   - rvm: 2.3.6
     env: INTEGRATION=yes
   - rvm: 2.4.3
     env: INTEGRATION=yes
   - rvm: ruby-head