Bumps [snakeyaml](https://bitbucket.org/snakeyaml/snakeyaml) from 1.30 to 1.31.
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<summary>Commits</summary>
<ul>
<li><a href="https://bitbucket.org/snakeyaml/snakeyaml/commits/a3e641b8d6337d9916b5d709278fd668b0eb8507"><code>a3e641b</code></a> Remove unused code for comments</li>
<li><a href="https://bitbucket.org/snakeyaml/snakeyaml/commits/d2ed56802d388afb4c714325e41afa8e095478b4"><code>d2ed568</code></a> Remove unused code</li>
<li><a href="https://bitbucket.org/snakeyaml/snakeyaml/commits/ab76f8678972f5eb3caaf3b473e63323bcea9e92"><code>ab76f86</code></a> Add <a href="https://github.com/Deprecated"><code>@​Deprecated</code></a> annotation to constructs marked with <a href="https://github.com/deprecated"><code>@​deprecated</code></a> javadoc.</li>
<li><a href="https://bitbucket.org/snakeyaml/snakeyaml/commits/bc7869b53e27caed452894986c5ee7c4b787a725"><code>bc7869b</code></a> Make billionLaughsAttackTest.billionLaughsAttackExpanded() robust</li>
<li><a href="https://bitbucket.org/snakeyaml/snakeyaml/commits/4cfb7b78ac9d414590da53557314ae97691dd63e"><code>4cfb7b7</code></a> Merged in make-billion-laughs-attack-test-robust (pull request <a href="https://bitbucket.org/snakeyaml/snakeyaml/issues/7">#7</a>)</li>
<li><a href="https://bitbucket.org/snakeyaml/snakeyaml/commits/da5ba160027ec9943d3cd3a67950ca57c15011b7"><code>da5ba16</code></a> Update changes.xml</li>
<li><a href="https://bitbucket.org/snakeyaml/snakeyaml/commits/23fbcef0e952adbea3fc147c6b17eb8ab7e3432a"><code>23fbcef</code></a> add test with JavaBean property of parameterized Collection</li>
<li><a href="https://bitbucket.org/snakeyaml/snakeyaml/commits/6385279ecb0b3ec623563ba934475eab100fb25e"><code>6385279</code></a> change how we set detected type to JavaBean Collection property item</li>
<li><a href="https://bitbucket.org/snakeyaml/snakeyaml/commits/04687842700919db5ba4baf176abf9b044b32a45"><code>0468784</code></a> force keyNode to be String for JavaBeans</li>
<li><a href="https://bitbucket.org/snakeyaml/snakeyaml/commits/467bcc9d06c6914e334b4c4052fa8aa27f092721"><code>467bcc9</code></a> expect node to be scalar when enforcings String keys</li>
<li>Additional commits viewable in <a href="https://bitbucket.org/snakeyaml/snakeyaml/branches/compare/snakeyaml-1.31..snakeyaml-1.30">compare view</a></li>
</ul>
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