Chopstx 2.0

[NIIBE Yutaka]

Hello,

Chopstx 2.0 is released.

	tag release/2.0
	Tagger: NIIBE Yutaka <gniibe at fsij.org>
	Date:   Fri Jun 26 10:05:17 2020 +0900
	commit 34e7673871d9825549a0788a7ed59af276be9357

This release is from master branch.

Major change is inclusion of RISC-V port.  I'm currently using
picolibc for RISC-V port.  I'm not sure, for now, if I will switch
to newlib.

As I wrote last year, the target board is Sipeed Longan nano.  It is
available at Seeed Studio as well as Digikey, Mouser, and Akiduki.
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