Update pluginPath guidance #273
Description
In v0.29, we introduced a breaking change where we renamed the pluginPath property value from ~appFolder/plugins/dev-proxy-plugins.dll to ~appFolder/plugins/DevProxy.Plugins.dll.
When users upgrade from v0.28 to v0.29 they will need to manually update the pluginPath values which might not be immediately obvious, so we should show an error and provide an action to update the value to the correct one.