[ FYI ] testing PANDOC_VERSION == {2,15} doesn't work

[K4zuki <k.yamamoto.08136891-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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Hello,

This is a kind of bug report for pandoc==2.15 specific.

I have faced strange behavior of lua filter, which processes Link, with 
pandoc==2.15. After some research, I found this is kinda related to issue 
#7639 (https://github.com/jgm/pandoc/issues/7639).

So now I am trying to put a message that filter won't work with 
pandoc==2.15 when it is so, like following code snippet, but Lua filter (or 
Lua subsystem) doesn't detect pandoc's version either.
```lua
if PANDOC_VERSION=={2,15} then
    print("this filter wont work with pandoc==2.15")
end
```
The message won't appear with pandoc==2.15. On the other hand, 
`tostring(PANDOC_VERSION)` returns "2.15". So if anyone trying to handle 
Link with pandoc==2.15, use tostring(PANDOC_VERSION) to filter out pandoc 
version.

For your information,
Kazuki Yamamoto / _K4ZUKI_ (https://twitter.com/_K4ZUKI_)

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