[Snyk] Upgrade graphql from 14.5.7 to 14.5.8

[snyk-bot]

Snyk has created this PR to upgrade graphql from 14.5.7 to 14.5.8.

• The recommended version is 1 version ahead of your current version.
• The recommended version was released a month ago, on 2019-09-25.

Release notes

• Package name: graphql
  • 14.5.8 - 2019-09-25

    v14.5.8 (2019-09-25)

    Bug Fix 🐞

    • #2195 tstypes: fix typings for 'isSpecifiedDirective'/'isSpecifiedScalarType' (@IvanGoncharov)

    Committers: 1

    • Ivan Goncharov(@IvanGoncharov)
  • 14.5.7 - 2019-09-20

    v14.5.7 (2019-09-20)

    Bug Fix 🐞

    • #2191 Fixes variable values of non-null type with default value (@IvanGoncharov)

    Committers: 1

    • Ivan Goncharov(@IvanGoncharov)
from [`graphql` GitHub Release Notes](https://github.com/graphql/graphql-js/releases)

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