Update dependency vue-i18n to v8.15.0

This MR contains the following updates:

Package	Type	Update	Change	References
vue-i18n	dependencies	minor	8.14.1 -> 8.15.0	source

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Release Notes

kazupon/vue-i18n

v8.15.0

Compare Source

⭐ New Features

• Add constructor option for custom modifiers (#​724) by @​epaezrubio (3217212), closes #​724

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

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