Update dependency eslint-config-synacor to v3

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
eslint-config-synacor	devDependencies	major	^1.1.0 -> ^3.0.0	source

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Release Notes

synacor/eslint-config-synacor

v3.0.3

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This makes it so that the legacy decorator syntax with export doesn't throw an error with the new babel-eslint version, such as:

@​myDecorator
export class MyClass

See: babel/babel-eslint#​662

v3.0.1

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v3.0.0

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Removed the eslint-config-compat package. It relied on caniuse-db which uses a CC-BY-4.0 Attribution license which is not compatible with our licensing preferences. In addition, eslint-config-compat was not catching many lint errors for us, so it is one less dependency for the project.

v2.1.0

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v2.0.4

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Add promises to the list of polyfills, since Synacor always polyfills promises in its code bases. This prevents eslint-plugin-compat from throwing errors about IE not supporting Promises.

v2.0.3

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Update all dependencies.

v2.0.2

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eslint-plugin-compat@2.0.0 broke eslint-config-synacor upon its release because we were using >= range versioning for dependencies. This version changes to a safer major version ^ range versioning for dependencies.

v2.0.0

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Add new rule react/display-name to ensure debugging tools can properly identify components

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