Added missing quote

[fschlag]

Added a missing quote for section Explicit fallback with an array of locales: en' changed to 'en'.

[codecov-commenter]

Codecov Report

Merging #925 into v8.x will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             v8.x     #925   +/-   ##
=======================================
  Coverage   96.42%   96.42%           
=======================================
  Files          10       10           
  Lines         896      896           
=======================================
  Hits          864      864           
  Misses         32       32           

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[exoego]

Thanks !!
Could you also fix missing quote in source file (markdown file): https://github.com/kazupon/vue-i18n/blob/v8.x/gitbook/en/fallback.md

[fschlag]

Fixed there too.

[kazupon]

Good Catch!
Thanks!