use specific 6 version

coke · coke · commit 923fa1af0f01 · 2018-03-27T15:43:48.000-04:00
diff --git a/htmlify.p6 b/htmlify.p6
@@ -1,5 +1,5 @@
 #!/usr/bin/env perl6
-use v6;
+use v6.c;
 
 =begin overview
 
