[CI] Update Ruby versions Travis and Jenkins

Author: picandocodigo

.ci/test-matrix.yml

@@ -3,6 +3,7 @@ ELASTICSEARCH_VERSION:
 - 6.8-SNAPSHOT
 
 RUBY_TEST_VERSION:
+- 2.7.0
 - 2.6.5
 - 2.5.7
 - 2.4.9

.travis.yml

@@ -25,19 +25,27 @@ matrix:
       jdk: oraclejdk8
       env: TEST_SUITE=unit
 
-    - rvm: 2.6.1
+    - rvm: 2.3.8
       jdk: oraclejdk8
       env: TEST_SUITE=unit
 
-    - rvm: 2.3.8
+    - rvm: 2.4.9
+      jdk: oraclejdk8
+      env: TEST_SUITE=unit
+
+    - rvm: 2.5.7
+      jdk: oraclejdk8
+      env: TEST_SUITE=unit
+
+    - rvm: 2.6.5
       jdk: oraclejdk8
       env: TEST_SUITE=unit
 
-    - rvm: jruby-9.2.5.0
+    - rvm: jruby-9.2.9.0
       jdk: oraclejdk8
       env: TEST_SUITE=unit
 
-    - rvm: 2.6.1
+    - rvm: 2.6.5
       jdk: oraclejdk8
       env: QUIET=y TEST_SUITE=integration