update Crystal to 0.7.7

README.md

@@ -35,7 +35,7 @@ Please see [mal test cases](https://github.com/rhysd/Crisp/tree/master/spec/cris
 ## Development Environment
 
 - OS X
-- Crystal 0.7.1 ~ 0.7.3
+- Crystal 0.7.1 ~ 0.7.3 or 0.7.7
 
 ## License
 

src/crisp/core.cr

@@ -339,7 +339,7 @@ module Crisp
   end
 
   def time_ms(args)
-    p">(Time.now.to_i.to_i32) * 1000
+    Time.now.epoch_ms.to_i32
   end
 
   # Note: