fix(create-vuepress): wrong registry command

[PiperLiu]

Before submitting the PR, please make sure you do the following

• Read the Contributing Guidelines.
• Provide a description in this PR that addresses what the PR is solving. If this PR is going to solve an existing issue, please reference the issue (e.g. close #123).

What is the purpose of this pull request?

• Bug fix
• New feature
• Other

Description

Close #311

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[coveralls]

Pull Request Test Coverage Report for Build 12374251705

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 60.196%

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Totals
Change from base Build 12366924903:	0.0%
Covered Lines:	1308
Relevant Lines:	1969

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💛 - Coveralls