Update vue-template-compiler to the latest version 🚀

[greenkeeper[bot]]

The devDependency vue-template-compiler was updated from 2.5.16 to 2.5.18.

This version is not covered by your current version range.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

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[greenkeeper[bot]]

• The devDependency vue-template-compiler was updated from 2.5.16 to 2.5.19.

Update to this version instead 🚀

Release Notes for v2.5.19

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