chore(deps): update dependency vue to v2.5.21

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
vue	devDependencies	patch	2.5.16 -> 2.5.21	source

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Release Notes

vuejs/vue

v2.5.21

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Bug Fixes

• lifecycle: beforeUpdated should not be called if component is destroyed (#​9171) 87bad80, closes #​9171 #​8076
• types: accept primatives and falsy values in createElement children (#​9154) d780dd2, closes #​9154 #​8498
• v-model: properly handle multiline v-model expressions (#​9184) 3d44937, closes #​9184 #​9183
• weex: support data class type that is string (#​9139) d8285c5, closes #​9139 #​9124
• fix single v-for child optimization 847e493
• fix v-for component with undefined value 4748760, closes #​9181

Performance Improvements

• skip normalization on single child element v-for 4074104

v2.5.20

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Bug Fixes

• types: avoid this in VueConstructor signature (#​9173) e06d2af

v2.5.19

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Bug Fixes

• ssr: should not warn for custom directives that do not have ssr implementation 780dac5, closes #​9167
• vdom: remove unnecessary sameVnode condition 0d4b35f, closes #​9168

Reverts

• fix(sfc): avoid deindent when pad option is specified (#​7647) 5d721a4, closes #​7647

v2.5.18

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Includes everything in 2.5.18-beta.0

Bug Fixes

• compiler: fix codegen for v-for component inside template 1b4a8a0, closes #​9142
• ssr: fix ssr template publicPath generation f077ed1, closes #​9145
• fix keyName checking for space and delete in IE11 (#​9150) 0ed0aad, closes #​9150 #​9112
• transition-group: fix activeInstance regression 8a2dbf5, closes #​9151
• types: correct scopedSlot types (#​9131) 448ba65, closes #​9131 #​8946
• types: type support for advanced async components (#​8438) dfaf9e2, closes #​8438

v2.5.17

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NOTE: this is a hot fix that contains the following changes only, and does NOT include any changes from 2.5.17-beta.0.

Bug Fixes

• fix potential xss vulnerability in ssr when using v-bind c28f792

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[codecov]

Codecov Report

Merging #52 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #52   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           1      1           
  Lines          38     38           
=====================================
  Hits           38     38

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