Update dependency vuepress to v1.5.4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
vuepress	devDependencies	minor	1.4.1 -> 1.5.4

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Release Notes

vuejs/vuepress

v1.5.4

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Bug Fixes

• $core: decode regularPath when generate router config (fix #​1946) (#​1947) (dd26c7c)
• $shared-utils: fix date parse logic for permalinks (#​2181) (d4d0380)
• $shared-utils: replace diacritics with regex (#​1855) (a03e93d)
• $theme-default: overlap navbar dropdown menus (fix #​2227) (#​2365) (ceb0fa9)
• $theme-default: remove invalidate aria-labelledby on homepage title(#​2277) (94a7de4)

v1.5.3

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Bug Fixes

• $theme-default: fix editLink for repos hosted on gitlab.com (#​2523) (1c3967c)
• add toml dependencyt to shared-utils (b858a6e)
• regular files should not be executable (#​2535) (ffb8527)
• $theme-default: improve last-updated text color contrast (#​2282) (7ca9fbc)
• allows no rel attribute on external links in the nav (#​2338) (b343cd3)
• $core: style loss under build for package that specifies sideEffects: false (fix #​2350) (#​2471) (7e29900)
• $markdown: line highlighting not working correctly when importing code snippets (#​2441) (d0f2e42)

Features

• $theme-default: add initial open group index option (#​2408) (465ae40)

v1.5.2

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Bug Fixes

• $core: check if meta is from head before removing it (#​2403) (3c94f71)
• $theme-default: handle algolia search result with Chinese hash (close: #​2431) (#​2432) (6183840)

Features

• $theme-default: allow 'auto' in defined sidebars (close: #​1252) (#​2380) (597f83b)

v1.5.1

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Bug Fixes

• $core: HMR issue caused by chokidar v3 (close: #​2392) (#​2436) (7e9d0c1)
• $shared-utils: use title variable for homepage (close: #​2247) (#​2307) (869eb8d)

v1.5.0

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Bug Fixes

• $core: include polyfills correctly (close #​1168) (#​2317) (69c193a)
• $core: no dynamic import style (#​1490) (c80c36b)

Features

• $markdown: snippet partial import (#​2225) (2f1327b)

Reverts

• fix($theme-default): close dropdown on mouseout (fix #​2227)" (f54b389)

1.4.1 (2020-04-15)

Bug Fixes

• $core: missing 404 page (close #​2248) (#​2250) (28a4eab)
• $core: duplicate meta tags (#​2164) (01cd096)
• $plugin-search: match non-ASCII chars (close #​2242) (#​2283) (9f3f49c)
• $shared-utils: fail to resolve markdown-it plugins (close #​2286)(#​2289) (16df156)
• $theme-default: close dropdown on mouseout (fix #​2227) (#​2303) (430b917)

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