Update crystal version to 0.28

alex-lairan · alex-lairan · commit dcec9c958f65 · 2019-05-06T09:14:23.000+02:00
diff --git a/shard.yml b/shard.yml
@@ -4,7 +4,7 @@ version: 0.2.0
 authors:
   - Alexandre Lairan <lairana@free.fr>
 
-crystal: 0.26.1
+crystal: 0.28.0
 
 license: MIT
 
