Bump spring-webmvc from 5.1.6.RELEASE to 5.2.20.RELEASE in /otus_2019_06/hw13-maven#68

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dependabot/maven/otus_2019_06/hw13-maven/org.springframework-spring-webmvc-5.2.20.RELEASEdeft1991/otus:dependabot/maven/otus_2019_06/hw13-maven/org.springframework-spring-webmvc-5.2.20.RELEASECopy head branch name to clipboard