+semver: upgrade to net5.0 (#1390)

* breaking upgrade base build image to net5.0

* add make and build tools to image

* fix code broken after net5.0 upgrade

* fix warnings

* fix tests and line endings

* upgrade dotnet test and coverages packages

* update circle build image

* removed rafty and updated more packages

* bring back develop

* rename authorisation to authorization

test/Ocelot.AcceptanceTests/WebSocketTests.cs

@@ -57,7 +57,7 @@ namespace Ocelot.AcceptanceTests
                 .And(_ => _steps.StartFakeOcelotWithWebSockets())
                 .And(_ => StartFakeDownstreamService($"http://{downstreamHost}:{downstreamPort}", "/ws"))
                 .When(_ => StartClient("ws://localhost:5000/"))
-                .Then(_ => _firstRecieved.Count.ShouldBe(10))
+                .Then(_ => ThenTheReceivedCountIs(10))
                 .BDDfy();
         }
 
@@ -323,8 +323,12 @@ namespace Ocelot.AcceptanceTests
             {
                 Console.WriteLine(e);
             }
+        }
+
+        private void ThenTheReceivedCountIs(int count)
+        {
+            _firstRecieved.Count.ShouldBe(count);
         }
-
         public void Dispose()
         {
             _serviceHandler?.Dispose();