Bump snakeyaml from 1.30 to 1.31 (#330)

Bumps [snakeyaml](https://bitbucket.org/snakeyaml/snakeyaml) from 1.30 to 1.31.
- [Commits](https://bitbucket.org/snakeyaml/snakeyaml/branches/compare/snakeyaml-1.31..snakeyaml-1.30)

---
updated-dependencies:
- dependency-name: org.yaml:snakeyaml
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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pom.xml

@@ -95,7 +95,7 @@
       <dependency>
         <groupId>org.yaml</groupId>
         <artifactId>snakeyaml</artifactId>
-        <version>1.30</version>
+        <version>1.31</version>
       </dependency>
       <dependency>
         <groupId>org.commonmark</groupId>