Build CI against modern rubies (wingrunr21#2)

* Build CI against modern rubies I am not comfortable deprecating support for 2.1/2.2/2.3 etc until it starts becoming a pain point at run-time due to deprecation warnings, or when adding new features or fixing bugs. * Tempfile is not included in stdlib in modern ruby Depending on it implicitly seems like the kind of thing that could cause downstream suffering.
etlund · Jan 15, 2020 · b284e5c · b284e5c
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diff --git a/.travis.yml b/.travis.yml
@@ -5,3 +5,8 @@ rvm:
   - 2.0
   - 2.1
   - 2.2
+  - 2.3
+  - 2.4
+  - 2.5
+  - 2.6
+  - 2.7
diff --git a/lib/griddler/mandrill/adapter.rb b/lib/griddler/mandrill/adapter.rb
@@ -1,3 +1,4 @@
+require 'tempfile'
 module Griddler
   module Mandrill
     class Adapter
-Original file line number
+Diff line change
@@ Expand Up / @@ -5,3 +5,8 @@ rvm: @@
       - 2.0
       - 2.1
       - 2.2
+      - 2.3
+      - 2.4
+      - 2.5
+      - 2.6
+      - 2.7