No longer mark as developmentDependency in nuspec to work beter with sdk-style projects

Author: ManlyMarco

RuntimeUnityEditor.Core.Mono/RuntimeUnityEditor.Core.Mono.nuspec

@@ -7,7 +7,6 @@
     <projectUrl>https://github.com/ManlyMarco/RuntimeUnityEditor</projectUrl>
     <requireLicenseAcceptance>false</requireLicenseAcceptance>
     <description>In-game inspector and debugging tools for applications made with Unity3D game engine</description>
-    <developmentDependency>true</developmentDependency>
     <tags></tags>
   </metadata>
   <files>