Merge pull request qiniu#173 from CarlJi/0303

fix: exit successfully when catch specific signal

Merge pull request qiniu#168 from tongjingran/update_copy

Update copy to v1.4.2

Merge pull request qiniu#166 from CarlJi/0217

doc: update wechat image

Merge pull request qiniu#150 from tongjingran/buildCopy2

optimize the file copy strategy of `goc build` and fix bugs

Merge pull request qiniu#148 from qiniu/revert-143-buildCopy

Revert "optimize the file copy strategy of `goc build`"

Merge pull request qiniu#129 from Vieira-zj/fix-zj-20201111

Fix nil issue when failed to register with coverage center.

Merge pull request qiniu#124 from lyyyuna/cover-next

Do cover in another way

Merge pull request qiniu#125 from CarlJi/1007

doc: update wechat group image

Merge pull request qiniu#104 from CarlJi/0831

goc profile: add coverfile flag

Merge pull request qiniu#91 from lyyyuna/goc-89

add merge command