Bump slimmer from 18.1.0 to 18.2.0 #414

Job	Run time
Lint JavaScript / Run Standardx	15s
Lint Ruby / Run RuboCop	20s
Lint SCSS / Run Stylelint	15s
Security Analysis / Run Brakeman	19s
Test JavaScript / Run Jasmine	1m 6s
Test Ruby / Run RSpec	1m 15s
	3m 30s

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