Gemfile in dotenv-0.9.0 vs Gemfile in dotenv-0.10.0

@@ -1,6 +1,12 @@
 source 'https://rubygems.org'
 gemspec :name => 'dotenv'
 
-gem 'guard-rspec'
-gem 'guard-bundler'
-gem 'rb-fsevent'
+group :guard do
+  gem 'guard-rspec'
+  gem 'guard-bundler'
+  gem 'rb-fsevent'
+end
+
+platforms :rbx do
+  gem 'rubysl', '~> 2.0'         # if using anything in the ruby standard library
+end
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