update:修改@PrevInsert文档的措辞

fix: nutzam#1489

release: 1.r.68.v20190329

release: 1.r.68.v20190318

release: v1.r.67

release: v1.r.66

release: v1.r.65

release: 1.r.63.r4

update: 为配合nutzboot发布2.0,添加一个维护版本

Merge branch 'master' into v1.r.63-dev