Fix spelling error

Rakefile

@@ -257,7 +257,7 @@ multitask :push do
   cp_r "#{public_dir}/.", deploy_dir
   cd "#{deploy_dir}" do
     system "git add -A"
-    puts "\n## Commiting: Site updated at #{Time.now.utc}"
+    puts "\n## Committing: Site updated at #{Time.now.utc}"
     message = "Site updated at #{Time.now.utc}"
     system "git commit -m \"#{message}\""
     puts "\n## Pushing generated #{deploy_dir} website"