Travis: update Rubies

Author: dmke

.travis.yml

@@ -8,9 +8,9 @@ before_install:
   - bin/provision.sh
 rvm:
   - 2.2.9
-  - 2.3.7
-  - 2.4.4
-  - 2.5.1
+  - 2.3.8
+  - 2.4.5
+  - 2.5.3
   - ruby-head
 env:
   - TEST_TASK=spec
@@ -20,29 +20,29 @@ matrix:
     - rvm: jruby-head
     - rvm: ruby-head
     - rvm: jruby-9.1.5.0
-    - rvm: 2.5.1
+    - rvm: 2.5.3
       env: influx_version=nightly channel=nightlies
   include:
-    - rvm: 2.5.1
+    - rvm: 2.5.3
       env: TEST_TASK=rubocop
     - rvm: jruby-9.1.5.0
     - rvm: jruby-head
       env: JRUBY_OPTS='--client -J-XX:+TieredCompilation -J-XX:TieredStopAtLevel=1 -J-Xss2m -J-Xmx256M'
-    - rvm: 2.5.1
+    - rvm: 2.5.3
       env: influx_version=1.0.2 pkghash=88f6c30fec2c6e612e802e23b9161fdfc7c5c29f6be036f0376326445aff0037
-    - rvm: 2.5.1
+    - rvm: 2.5.3
       env: influx_version=1.1.0 pkghash=f1520a2e18e0ab47e8a8810671e07d5a47960e54f7553b78bebe7d3c7594742f
-    - rvm: 2.5.1
+    - rvm: 2.5.3
       env: influx_version=1.2.4 pkghash=2fac8391e04aa1bec9151e8f0d8f18df030c866af2b4963ab7d86c6ddc172182
-    - rvm: 2.5.1
+    - rvm: 2.5.3
       env: influx_version=1.3.6 pkghash=6406cdd21466bcb832b967078adaa9f07cb6ae524a6579c15141692031f5f840
-    - rvm: 2.5.1
+    - rvm: 2.5.3
       env: influx_version=1.4.3 pkghash=0477080f1d1cf8e1242dc7318280b9010c4c45cf6a415a2a5de607ae17fa0359
-    - rvm: 2.5.1
+    - rvm: 2.5.3
       env: influx_version=1.5.2 pkghash=42fede7b497bdf30d4eb5138db218d1add986fca4fce4a8bcd9c7d6dabaf572a
-    - rvm: 2.5.1
+    - rvm: 2.5.3
       env: influx_version=1.6.1 pkghash=a833ac16890182a75983c61e5fe6471ae27cbab7984d7b7361034887b7428de2
-    - rvm: 2.5.1
+    - rvm: 2.5.3
       env: influx_version=nightly channel=nightlies
   fail_fast: true
 addons: