Use SPDX license id in package.json

[marek-saji]

Description

package.json should include SPDX license id in license field.

Hence: Apache 2.0 → Apache-2.0.

[cla-bot]

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[marek-saji]

CLA signed and sent

[ais8xl]

Hello, anyone can fix the deprecation errors in mailchimp-marketing (https://github.com/mailchimp/mailchimp-marketing-php)?