[synchronous] rt-thread 3.1.3#2

Merged

BernardXiong merged 4 commits into

RT-Thread:masterfrom

yangjie11:yj_dev_1

Feb 17, 2020

Commits on Oct 29, 2019

nano 3.1.3
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Commits on Nov 5, 2019

Commits on Dec 27, 2019

同步 nano-3.1.3-zip 的内容
 yangjie11
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