[Snyk] Upgrade vue-i18n from 7.8.1 to 8.15.0

[snyk-bot]

Snyk has created this PR to upgrade vue-i18n from 7.8.1 to 8.15.0.

Warning: This is a major version upgrade, and may be a breaking change.

• The recommended version is 25 versions ahead of your current version.
• The recommended version was released 10 days ago, on 2019-10-16.

Release notes

• Package name: vue-i18n
  • 8.15.0 - 2019-10-16

    v8.15.0 (2019-10-16)

    ⭐️ New Features

    • Add constructor option for custom modifiers (#724) by @epaezrubio (3217212), closes #724
  • 8.14.1 - 2019-09-12

    8.14.1 (2019-09-12)

    🐛 Bug Fixes

    • path: fix branket key error (8d2aba7)
    • component: Fix interpolation component when there are empty text nodes (547cdd1) by @Demivan
  • 8.14.0 - 2019-08-12

    v8.14.0 (2019-08-12)

    ⭐️ New Features

    • fallback formatting (#637) by @sebwas (bf9929c), closes #637
    • support slots syntax for component interpolation (#685) by @aavondet (71ca843), closes #685
  • 8.13.0 - 2019-08-09

    v8.13.0 (2019-08-09)

    ⭐️ New Features

    • datetime/number formats fallback warning filter (46de19e), closes #558
    • fallback translation warning filter (69fc798)
    • translation missing warning filter (666dc9d)
  • 8.12.0 - 2019-07-09

    v8.12.0 (2019-07-09)

    ⭐️ New Features

    • mixin: shared locale messages feature (82543de)

    ⚡️ Improvements

    • typing: sharedMessages option type (6967a15)
  • 8.11.2 - 2019-04-30

    v8.11.2 (2019-04-30)

    🐛 Bug Fixes

    • bug(mixin): fix SSR memory leak by moving subscribeDataChanging calls into beforeMount (#572) by @Pindar (32b5795), closes #572
  • 8.11.1 - 2019-04-26

    v8.11.1 (2019-04-26)

    🐛 Bug Fixes

    • fix ES Modules distribution (bb631a1)
  • 8.11.0 - 2019-04-26

    v8.11.0 (2019-04-26)

    ⭐️ New Features

    • ES modules for browser (#561) (c9b9adf), closes #561
    • HTML locale message warning option (#567) (4aecf03), closes #567
  • 8.10.0 - 2019-03-28

    v8.10.0 (2019-03-28)

    ⭐️ New Features

    • number: i18n-n functional component (#541) by @bponomarenko (b33579d), closes #541
    • path: Keypath should parse if sub path contains spaces. (#533) by @exoego (640daaf), closes #533

    ⚡️ Improvements

    • number: support data fall through in i18n-n (#545) (71cadbf), closes #545

    📝 docs

    • vuepress: translate documents for chinese (#536) by @xuhongbo (ccf29f8), closes #536 #531 #1 #533 #540 #541 #1 #2
  • 8.9.0 - 2019-03-08

    v8.9.0 (2019-03-08)

    🐛 Bug Fixes

    • index: Fix #515 empty string not returning true (#525) by @kimuraz (396c5ca), closes #515 #525 #515

    ⭐️ New Features

    • index: add availableLocales (related issue #193, PR #528) by @exoego (8f75b1f), closes #193 #528 #193 #193 #193 #193

    ⚡️ Improvements

    • flowtype: Fix missing type declarations in flow type (#529) by @exoego (4173764), closes #529
  • 8.8.2 - 2019-02-17

      </li>
      <li>
        <b>8.8.1</b> - <a href="">2019-02-10</a>
        
      </li>
      <li>
        <b>8.8.0</b> - <a href="">2019-01-29</a>
        
      </li>
      <li>
        <b>8.7.0</b> - <a href="">2019-01-02</a>
        
      </li>
      <li>
        <b>8.6.0</b> - <a href="">2018-12-25</a>
        
      </li>
      <li>
        <b>8.5.0</b> - <a href="">2018-12-17</a>
        
      </li>
      <li>
        <b>8.4.0</b> - <a href="">2018-11-30</a>
        
      </li>
      <li>
        <b>8.3.2</b> - <a href="">2018-11-16</a>
        
      </li>
      <li>
        <b>8.3.1</b> - <a href="">2018-11-08</a>
        
      </li>
      <li>
        <b>8.3.0</b> - <a href="">2018-10-29</a>
        
      </li>
      <li>
        <b>8.2.1</b> - <a href="">2018-10-15</a>
        
      </li>
      <li>
        <b>8.2.0</b> - <a href="">2018-10-13</a>
        
      </li>
      <li>
        <b>8.1.1</b> - <a href="">2018-10-12</a>
        
      </li>
      <li>
        <b>8.1.0</b> - <a href="">2018-09-03</a>
        
      </li>
      <li>
        <b>8.0.0</b> - <a href="">2018-06-23</a>
        
      </li>
      <li>
        <b>7.8.1</b> - <a href="">2018-06-18</a>
        
      </li>
    </ul>
    

  from [`vue-i18n` GitHub Release Notes](https://github.com/kazupon/vue-i18n/releases)

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