[flori/json] Bump up json version to 2.6.0

https://github.com/flori/json/commit/1942689b67
2021-10-14 16:44:36 +09:00 · 2021-10-14 16:44:36 +09:00 · 91c2069dcf
--- a/ext/json/VERSION
+++ b/ext/json/VERSION
@ -1 +1 @@
-2.5.1
+2.6.0
 @ -1 +1 @@
 .5.1
 .6.0