Pin dependency @babel/plugin-proposal-class-properties to 7.5.5

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
@babel/plugin-proposal-class-properties	devDependencies	pin	^7.5.5 -> 7.5.5

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[coveralls]

Pull Request Test Coverage Report for Build 1881

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 1879:	0.0%
Covered Lines:	84
Relevant Lines:	84

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💛 - Coveralls