Pin sqlite for Ruby 2.7

Rakefile

@@ -57,6 +57,9 @@ task :generate_test_gem => ['engine_cart:setup'] do
     end
 
     system "echo '\ngem \"rspec-rails\"\n' >> Gemfile"
+    if RUBY_VERSION < '3.0'
+      system "echo '\ngem \"sqlite3\", \"< 1.7.0\"\n' >> Gemfile"
+    end
 
     Bundler.clean_system "bundle update --quiet"
     system "echo 'require \"engine_cart/rake_task\"\n' >> Rakefile"

lib/engine_cart/tasks/engine_cart.rake

@@ -76,6 +76,15 @@ namespace :engine_cart do
           text.gsub(/^gem ["']sqlite3["']$/, 'gem "sqlite3", "~> 1.3.0"')
         end)
       end
+
+      if RUBY_VERSION < '3.0'
+        # Hack for https://github.com/cbeer/engine_cart/issues/125
+        gemfile = File.join(EngineCart.destination, 'Gemfile')
+        IO.write(gemfile, File.open(gemfile) do |f|
+          text = f.read
+          text.gsub(/^gem ["']sqlite3["']$/, 'gem "sqlite3", "< 1.7"')
+        end)
+      end
     end
   end