print in preval-0.3.0

- old
+ new

@@ -3,8 +3,9 @@
 require 'bundler/setup'
 require 'preval'
 
 Preval::Visitors::Arithmetic.enable!
 Preval::Visitors::Loops.enable!
+Preval::Visitors::Micro.enable!
 
 source = ARGV.first
 puts Preval.process(File.exist?(source) ? File.read(source) : source)