string form `caveats` in pemdas-widget.rb

Casks/pemdas-widget.rb

@@ -7,8 +7,7 @@ class PemdasWidget < Cask
   license :oss
 
   widget 'PEMDAS.wdgt'
-  caveats do
-    puts <<-EOS.undent
+  caveats <<-EOS.undent
     Currently, Dashboard Widgets such as '#{@cask}' do NOT work correctly
     when installed via brew-cask.  The bug is being tracked here:
 
@@ -16,7 +15,5 @@ class PemdasWidget < Cask
 
     It is recommended that you do not install this Cask unless you are
     a developer working on the problem.
-
   EOS
-    end
 end