chore(deps): update kramdown-rfc requirement from 1.7.30 to 1.7.35 (#235)

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Author: dependabot[bot]

Gemfile

@@ -1,3 +1,3 @@
 source "https://rubygems.org"
 
-gem "kramdown-rfc", "1.7.30"
+gem "kramdown-rfc", "1.7.35"