How to make Rider CsprojAssetPostprocessor the last one

Bootstrap.cs

using System;
using System.Reflection;
using UnityEditor;
using UnityEngine;

namespace JetBrains.Rider.Unity.Editor.AssetPostprocessors
{
  [InitializeOnLoad]
  public static class Bootstrap
  {
    static Bootstrap()
    {
      if (UnityUtils.UnityVersion > new Version(2017, 1))
      {
        Assembly[] loadedAssemblies = (Assembly[]) ourSLoadedAssembliesGetter?.Invoke(null, new object[0]);
        if (loadedAssemblies == null)
        {
          Debug.LogError("Error getting 'UnityEditor.EditorAssemblies.loadedAssemblies' by reflection");
          return;
        }

        if (ShiftToLast(loadedAssemblies, a => Equals(a, typeof(CsprojAssetPostprocessor).Assembly)))
        {
          CsprojAssetPostprocessor.OnGeneratedCSProjectFiles();
        }
      }
    }

    private static bool ShiftToLast<T>(this T[] list, Predicate<T> predicate)
    {
      int lastIdx = list.Length - 1;
      int idx = Array.FindIndex(list, predicate);
      if (lastIdx < 0 || idx < 0 || idx == lastIdx) return false;
      T temp = list[idx];
      Array.Copy(list, idx + 1, list, idx, lastIdx - idx);
      list[lastIdx] = temp;
      return true;
    }

    private static readonly MethodInfo ourSLoadedAssembliesGetter = typeof(EditorWindow)
      .Assembly.GetType("UnityEditor.EditorAssemblies")
      ?.GetProperty("loadedAssemblies", BindingFlags.Static | BindingFlags.NonPublic)
      ?.GetGetMethod(true);
  }
}

@van800 I am using this in my Unity project since Rider did not want to accept the override lang version option set to 6 and was always handling the project assuming it is targetting C# 7 with suggestions such as inlined out variables that do not work in Unity yet. Unfortunately with the Rider version JetBrains Rider 2018.2 #RD-182.4231.193 it no longer works for me. Is this a known issue yet?

@NearAutomata
For some reason I am not getting notifications about the gist comments.
It is better to rise an issue in https://github.com/JetBrains/resharper-unity/
Please mention your OS, Unity version, what value exactly ends up in LangVersion Property in csproj?
And please add logs similar to requested here
JetBrains/resharper-unity#751 (comment)