Bump approvaltests from 9.3.0 to 18.4.0#173

dependabot[bot] wants to merge 1 commit intomasterLearnWithLlew/DuplicationKata.java:masterfrom

dependabot/gradle/com.approvaltests-approvaltests-18.4.0LearnWithLlew/DuplicationKata.java:dependabot/gradle/com.approvaltests-approvaltests-18.4.0Copy head branch name to clipboard