enable exit on failure

refs: rails/thor#244

Author: thaim

lib/weekdone/cli/command.rb

@@ -3,6 +3,10 @@
 
 module Weekdone::Cli
   class Command < Thor
+    def self.exit_on_failure?
+      true
+    end
+
     desc "login", "oauth login to weekdone"
     def login
       client_id = ENV['WEEKDONE_CLIENT_ID']