files should be a sibling not a child of metadata

Author: siywilliams

FluentCommandLineParser.Signed.nuspec

@@ -14,8 +14,8 @@
     <releaseNotes>https://github.com/fclp/fluent-command-line-parser/wiki/Roadmap</releaseNotes>
     <copyright>Copyright Simon Williams 2012 - 2017</copyright>
     <tags>fluent command line parser commandline c# net35</tags>
-    <files>
-        <file src="FluentCommandLineParser\bin\release-signed\FluentCommandLineParser.dll" target="lib" />
-    </files>
   </metadata>
+  <files>
+    <file src="FluentCommandLineParser\bin\release-signed\FluentCommandLineParser.dll" target="lib" />
+  </files>
 </package>