remove old empty Telepathy.dll + meta file. This causes a confusing 'failed to parse meta file' warning in Unity 2019.3, and we don't need it anymore anyway. UNET never had Telepathy.

Assets/Mirror/Runtime/Transport/Telepathy/Telepathy.dll.meta

@@ -1,30 +0,0 @@
-fileFormatVersion: 2
-guid: cc38a12e9b5834143976137abe1c8f23
-PluginImporter:
-  externalObjects: {}
-  serializedVersion: 2
-  iconMap: {}
-  executionOrder: {}
-  isPreloaded: 0
-  isOverridable: 0
-  platformData:
-  - first:
-      Any:
-    second:
-      enabled: 1
-      settings: {}
-  - first:
-      Editor: Editor
-    second:
-      enabled: 0
-      settings:
-        DefaultValueInitialized: true
-  - first:
-      Windows Store Apps: WindowsStoreApps
-    second:
-      enabled: 0
-      settings:
-        CPU: AnyCPU
-  userData:
-  assetBundleName:
-  assetBundleVariant: