Update dependency json-server to v0.15.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
json-server	devDependencies	minor	0.14.2 -> 0.15.1

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Release Notes

typicode/json-server

v0.15.1

Compare Source

• Upgrade dependencies
• Fix for multiple _ne operators #​1013

v0.15.0

Compare Source

• Breaking Require Node 8
• Upgrade dependencies
• Reduce package size

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