Removed attempt at Rails 5.1 testing

.travis.yml

@@ -1,7 +1,6 @@
 language: ruby
 
 env:
-  - 'RAILS_VERSION=5.1.0'
   - 'RAILS_VERSION=5.2.0'
   - 'RAILS_VERSION=6.0.0'
   - 'RAILS_VERSION=6.1.0'

Gemfile

@@ -11,7 +11,7 @@ end
 rails_version = ENV['RAILS_VERSION'] || 'default'
 rails = case rails_version
         when 'default'
-          '~> 5.1'
+          '~> 5.2'
         when 'master'
           {github: 'rails/rails'}
         else
@@ -37,7 +37,6 @@ group :development, :test do
 end
 
 group :test do
-  gem 'puma'
   # Adds support for Capybara system testing and selenium driver
   gem 'capybara', '>= 2.15'
   gem 'selenium-webdriver'

README.md

@@ -15,7 +15,8 @@ Abraham injects dynamically-generated [Shepherd](https://shepherdjs.dev/) JavaSc
 
 ## Requirements
 
-Abraham needs to know the current user to track tour views, e.g. `current_user` from Devise.
+* Abraham needs to know the current user to track tour views, e.g. `current_user` from Devise.
+* Abraham is tested on Rails 5.2, 6.0, and 6.1
 
 ## Installation
 
@@ -211,7 +212,7 @@ gem 'abraham', path: '~/Workspace/abraham'
 
 #### Automated testing
 
-We use TravisCI to automatically test this engine with Rails 5.1, 5.2, and 6.0. For test history, venture over to [TravisCI](https://travis-ci.com/actmd/abraham).
+We use TravisCI to automatically test this engine with Rails 5.2, 6.0, and 6.1. For test history, venture over to [TravisCI](https://travis-ci.com/actmd/abraham).
 
 ### Releasing