Chopstx 1.13 and FST-01SZ

[NIIBE Yutaka]

Hello,

FST-01SZ, which is now in production, uses a bit of different connector
(than its prototype).  This version has four slits in the bottom side.
I think that the purpose of change is to reduce materials.

I put the datasheet as:

    fst-01/datasheet/ZL-272-variant.pdf

But... it seems that... it looks like they (a company in Dong Guang,
next to ShenZhen) use competitor's manufacturer product number, although
it's a bit different.  This is confusing.  I wish the quality is good.
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