unity报错：
错误原因：
Framework target is set to Mono/.NET 3.5, however in Unity 5.5 while loading this dll, the following error appears: "Plugin targets .NET 4.x and is marked as compatible with Editor. Editor can use assemblies targetting .NET 3.5 or lower, please unselect Editor as compatible platform."
Steps to reproduce:
1. Open User's attached project with Unity 5.5 or newer
2. See the Error in the Console
Result: "Serializer" dll fails to load with "Plugin targets .NET 4.x and is marked as compatible with Editor..." message.
Reproduced with: 2017.1.0a3, 5.6.0f1, 5.5.2p2.
Not reproduced with: 5.4.5f1.
Note:
dll loads successfully with Unity 5.4
target framework for each project is set to "Mono/.NET 3.5"
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