Update dependencies to test on Rails 6.1

Author: Mattia Roccoberton

.rspec

@@ -1,3 +1,2 @@
 --require rails_helper
 --format documentation
---profile

Rakefile

@@ -1,3 +1,16 @@
 # frozen_string_literal: true
 
-require "bundler/gem_tasks"
+require 'bundler/gem_tasks'
+
+begin
+  require 'rspec/core/rake_task'
+
+  RSpec::Core::RakeTask.new(:spec) do |t|
+    # t.ruby_opts = %w[-w]
+    t.rspec_opts = ['--color', '--format documentation']
+  end
+
+  task default: :spec
+rescue LoadError
+  puts '! LoadError: no RSpec available'
+end

activeadmin_dynamic_fields.gemspec

@@ -19,13 +19,15 @@ Gem::Specification.new do |spec|
 
   spec.add_runtime_dependency 'activeadmin', '~> 2.0'
 
-  spec.add_development_dependency 'activestorage', '~> 6.0.3.2'
-  spec.add_development_dependency 'capybara', '~> 3.33.0'
-  spec.add_development_dependency 'pry', '~> 0.13.1'
-  spec.add_development_dependency 'puma', '~> 4.3.5'
-  spec.add_development_dependency 'rspec_junit_formatter', '~> 0.4.1'
-  spec.add_development_dependency 'rspec-rails', '~> 4.0.1'
-  spec.add_development_dependency 'rubocop', '~> 0.90.0'
-  spec.add_development_dependency 'selenium-webdriver', '~> 3.142.7'
-  spec.add_development_dependency 'sqlite3', '~> 1.4.2'
+  spec.add_development_dependency 'activestorage', '~> 6.0'
+  spec.add_development_dependency 'capybara', '~> 3.33'
+  spec.add_development_dependency 'pry', '~> 0.13'
+  spec.add_development_dependency 'puma', '~> 4.3'
+  spec.add_development_dependency 'rspec_junit_formatter', '~> 0.4'
+  spec.add_development_dependency 'rspec-rails', '~> 4.0'
+  spec.add_development_dependency 'rubocop', '~> 0.90'
+  spec.add_development_dependency 'sassc', '~> 2.4'
+  spec.add_development_dependency 'selenium-webdriver', '~> 3.142'
+  spec.add_development_dependency 'sprockets-rails', '~> 3.2'
+  spec.add_development_dependency 'sqlite3', '~> 1.4'
 end