Addon-Docs: Requires Vuejs as peer dependency

[tommyc38]

Describe the bug
@storybook/addon-docs requires vuejs.

To Reproduce
install @storybook/addon-docs

Expected behavior
I shouldn't have to install vuejs in my Angular application.

Screenshots

npm WARN @storybook/addon-docs@6.1.11 requires a peer of @storybook/vue@6.1.11 but none is installed. You must install peer dependencies yourself.
npm WARN @storybook/addon-docs@6.1.11 requires a peer of sveltedoc-parser@^3.0.4 but none is installed. You must install peer dependencies yourself.
npm WARN @storybook/addon-docs@6.1.11 requires a peer of vue@^2.6.10 but none is installed. You must install peer dependencies yourself.

Code snippets
If applicable, add code samples to help explain your problem.

System
System:
OS: macOS High Sierra 10.13.6
CPU: (12) x64 Intel(R) Core(TM) i7-8750H CPU @ 2.20GHz
Binaries:
Node: 10.14.2 - ~/.nvm/versions/node/v10.14.2/bin/node
Yarn: 1.22.10 - /usr/local/bin/yarn
npm: 6.4.1 - ~/.nvm/versions/node/v10.14.2/bin/npm
Browsers:
Chrome: 87.0.4280.88
Firefox: 68.0.1
Safari: 13.1.2
npmPackages:
@storybook/addon-docs: ^6.1.11 => 6.1.11
@storybook/addon-knobs: ^6.1.11 => 6.1.11
@storybook/addons: ^6.1.11 => 6.1.11
@storybook/angular: ^6.1.11 => 6.1.11

Additional context
Add any other context about the problem here.

[merceyz]

You don't have to as it's an optional peer dependency, but your NPM version is too old to understand that

[tommyc38]

@merceyz I just upgraded and they went away. Thank you!