Bump org.functionaljava:functionaljava-java8 from 4.6 to 4.8.1 (#21)

Bumps
[org.functionaljava:functionaljava-java8](https://github.com/functionaljava/functionaljava)
from 4.6 to 4.8.1.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/functionaljava/functionaljava/commit/cd201cce91343302d928f72d31ead35021261de9"><code>cd201cc</code></a>
4.8.1 release.</li>
<li><a
href="https://github.com/functionaljava/functionaljava/commit/921a2fd327fac95d145ab236e8994469701da4b5"><code>921a2fd</code></a>
Merge pull request <a
href="https://redirect.github.com/functionaljava/functionaljava/issues/369">#369</a>
from jbgi/fixes/missing-deprecated</li>
<li><a
href="https://github.com/functionaljava/functionaljava/commit/b797968ae46d5eafd951b03c68d649b9aae8f654"><code>b797968</code></a>
Fix javadoc warnings.</li>
<li><a
href="https://github.com/functionaljava/functionaljava/commit/4c93bae8c23385b9d9acc0e2358073384a10ae03"><code>4c93bae</code></a>
Update gradle. Fix gradle warnings.</li>
<li><a
href="https://github.com/functionaljava/functionaljava/commit/9f489c9428ff06ea39400239faa929eae9d78bba"><code>9f489c9</code></a>
Fix compile warnings.</li>
<li><a
href="https://github.com/functionaljava/functionaljava/commit/7b3cdae5e9d708904d72afffe039710ed8a9ad28"><code>7b3cdae</code></a>
Add missing <a
href="https://github.com/Deprecated"><code>@​Deprecated</code></a>
annotations (previously only on javadoc).</li>
<li><a
href="https://github.com/functionaljava/functionaljava/commit/e1a0983a365ca6a934dccf14a181a9ba486ccdd8"><code>e1a0983</code></a>
Add Strategy tests</li>
<li><a
href="https://github.com/functionaljava/functionaljava/commit/abb3263bb9f3cd8a3765f8a99ec94cb0852159ca"><code>abb3263</code></a>
Merge pull request <a
href="https://redirect.github.com/functionaljava/functionaljava/issues/368">#368</a>
from jbgi/backports/4.x</li>
<li><a
href="https://github.com/functionaljava/functionaljava/commit/c3ea5d36dd7869e8e4da411b4d9b926a44fb4bcd"><code>c3ea5d3</code></a>
Add Trampoline.suspend(final F0&lt;Trampoline<!-- raw HTML omitted
-->&gt; a).</li>
<li><a
href="https://github.com/functionaljava/functionaljava/commit/cf1188acafd62d60f1736a0d945790771029079b"><code>cf1188a</code></a>
Fix regression in lifted semigroup sum. Move lifted definition in
Monoid.</li>
<li>Additional commits viewable in <a
href="https://github.com/functionaljava/functionaljava/compare/v4.6...v4.8.1">compare
view</a></li>
</ul>
</details>
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pom.xml

@@ -80,7 +80,7 @@ We use these goals frequently to keep the dependencies and plugins up-to-date:
         <dependency>
             <groupId>org.functionaljava</groupId>
             <artifactId>functionaljava-java8</artifactId>
-            <version>4.6</version>
+            <version>4.8.1</version>
         </dependency>
         <dependency>
             <groupId>org.eclipse.collections</groupId>