Merge pull request #208 from jonathanhefner/installer-no-subshell

Use non-subshell `system` variant in installer

Author: jonathanhefner

lib/tasks/importmap_tasks.rake

@@ -1,6 +1,6 @@
 namespace :importmap do
   desc "Setup Importmap for the app"
   task :install do
-    system "#{RbConfig.ruby} ./bin/rails app:template LOCATION=#{File.expand_path("../install/install.rb",  __dir__)}"
+    system RbConfig.ruby, "./bin/rails", "app:template", "LOCATION=#{File.expand_path("../install/install.rb", __dir__)}"
   end
 end