update mysql and sqlite drivers (#444)

Author: drujensen

shard.yml

@@ -18,11 +18,11 @@ dependencies:
 development_dependencies:
   mysql:
     github: crystal-lang/crystal-mysql
-    version: ~> 0.12.0
+    version: ~> 0.13.0
 
   sqlite3:
     github: crystal-lang/crystal-sqlite3
-    version: ~> 0.17.0
+    version: ~> 0.18.0
 
   pg:
     github: will/crystal-pg