Drop Ruby 2.4 and Rails 5.0/5.1 support

Author: hennevogel

.travis.yml

@@ -10,22 +10,16 @@ rvm:
   - "2.7"
   - "2.6"
   - "2.5"
-  - "2.4"
 gemfile:
   - gemfiles/Gemfile.rails-6.0.x
   - gemfiles/Gemfile.rails-5.2.x
-  - gemfiles/Gemfile.rails-5.1.x
-  - gemfiles/Gemfile.rails-5.0.x
 env:
   - TEST_TASK=spec
 matrix:
   allow_failures:
     - rvm: ruby-head
   include:
     - { rvm: "2.6",   gemfile: "Gemfile", env: [TEST_TASK=rubocop] }
-  exclude:
-    # Rails > 5 not on MRI 2.4+
-    - { rvm: "2.4",   gemfile: "gemfiles/Gemfile.rails-6.0.x" }
 addons:
   apt:
     packages:

CHANGELOG.md

@@ -5,6 +5,8 @@ For the full commit log, [see here](https://github.com/influxdata/influxdb-rails
 ## v1.0.1.beta2
 - Implement [`deliver.action_mailer`](https://guides.rubyonrails.org/active_support_instrumentation.html#deliver-action-mailer) subscriber
 - Add missing Active Job documentation
+- Drop support for Ruby 2.4
+- Drop support for Rails < 5.2
 
 ## v1.0.1.beta1, released 2020-08-21
 - Drop support for Ruby 2.3