travis: bump versions

- add MRI 2.7 as new default
- bump JRuby to 9.2.9.0
- bump InfluxDB server to 1.7.9

Author: dmke

.travis.yml

@@ -9,6 +9,7 @@ rvm:
   - "2.4"
   - "2.5"
   - "2.6"
+  - "2.7"
   - ruby-head
 env:
   - TEST_TASK=spec
@@ -18,37 +19,37 @@ matrix:
     - rvm: jruby-head
     - rvm: ruby-head
     - rvm: jruby-9.1.17.0
-    - rvm: jruby-9.2.5.0
-    - rvm: "2.6"
+    - rvm: jruby-9.2.9.0
+    - rvm: "2.7"
       env: influx_version=nightly channel=nightlies
   include:
-    - rvm: "2.6"
+    - rvm: "2.7"
       env: TEST_TASK=rubocop
 
     - rvm: jruby-9.1.17.0
       env: JRUBY_OPTS='--client -J-XX:+TieredCompilation -J-XX:TieredStopAtLevel=1 -J-Xss2m -J-Xmx256M'
-    - rvm: jruby-9.2.5.0
+    - rvm: jruby-9.2.9.0
       env: JRUBY_OPTS='--client -J-XX:+TieredCompilation -J-XX:TieredStopAtLevel=1 -J-Xss2m -J-Xmx256M'
     - rvm: jruby-head
       env: JRUBY_OPTS='--client -J-XX:+TieredCompilation -J-XX:TieredStopAtLevel=1 -J-Xss2m -J-Xmx256M'
 
-    - rvm: "2.6"
+    - rvm: "2.7"
       env: influx_version=1.0.2 pkghash=88f6c30fec2c6e612e802e23b9161fdfc7c5c29f6be036f0376326445aff0037
-    - rvm: "2.6"
+    - rvm: "2.7"
       env: influx_version=1.1.5 pkghash=0ecb9385cc008f6e5094e6e8f8ea70522023a16d4397e401898f3973176d3b21
-    - rvm: "2.6"
+    - rvm: "2.7"
       env: influx_version=1.2.4 pkghash=2fac8391e04aa1bec9151e8f0d8f18df030c866af2b4963ab7d86c6ddc172182
-    - rvm: "2.6"
+    - rvm: "2.7"
       env: influx_version=1.3.8 pkghash=35c9cb2943bbde04aa5e94ad6d8caf5fc9b1480bdbcde7c34078de135cc4f788
-    - rvm: "2.6"
+    - rvm: "2.7"
       env: influx_version=1.4.3 pkghash=0477080f1d1cf8e1242dc7318280b9010c4c45cf6a415a2a5de607ae17fa0359
-    - rvm: "2.6"
+    - rvm: "2.7"
       env: influx_version=1.5.4 pkghash=fa6f8d3196d13ffc376d533581b534692c738181ce3427c53484c138d9e6b902
-    - rvm: "2.6"
+    - rvm: "2.7"
       env: influx_version=1.6.4 pkghash=dbfa13a0f9e38a8e7b19294c30144903bb681ac0aba0a3a8f4f349c37d5de5f9
-    - rvm: "2.6"
-      env: influx_version=1.7.2 pkghash=0bce61b7d89bf3216a7d3cb7a38423bd1c3a1b7d2ea8086b39cb26130ad78995
-    - rvm: "2.6"
+    - rvm: "2.7"
+      env: influx_version=1.7.9 pkghash=02759d70cef670d336768fd38a9cf2f046a1bf40618be78ba215e7ce75b5075f
+    - rvm: "2.7"
       env: influx_version=nightly channel=nightlies
 addons:
   apt: