Upgrade development to ruby@2.4.4

The upcoming release of `rails@6.0` (currently tested as `rails@master`) drops support for Ruby versions older than `2.4`: ``` activesupport-6.0.0.alpha requires ruby version >= 2.4.1, which is incompatible with the current version, ruby 2.2.2p95 ``` While we're upgrading Ruby version, update CI version matrix to use latest available patch versions and ensure the latest Rubygems version available.
exop-group · Mar 30, 2018 · 81bb2b3 · 81bb2b3
1 parent 69bd02b
commit 81bb2b3
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diff --git a/.ruby-version b/.ruby-version
@@ -1 +1 @@
-2.2.3
+2.4.4
diff --git a/.travis.yml b/.travis.yml
@@ -5,8 +5,9 @@ cache:
 notifications:
   email: false
 rvm:
-  - 2.3.0
-  - 2.2.2
+  - 2.4.4
+  - 2.3.7
+  - 2.2.10
   - jruby-9.0.3.0
 install: bin/setup_ci
 before_script:

diff --git a/bin/setup_ci b/bin/setup_ci
@@ -18,4 +18,6 @@ nvm alias default "$NODE_JS_VERSION" || true
 
 node --version
 
+gem update --system
+
 source bin/setup