Improve logging (#1230)

Improve logging

Author: MarcoRossignoli

src/coverlet.core/Coverage.cs

@@ -141,7 +141,7 @@ public CoveragePrepareResult PrepareModules()
                     }
                     catch (Exception ex)
                     {
-                        _logger.LogWarning($"Unable to instrument module: {module} because : {ex.Message}");
+                        _logger.LogWarning($"Unable to instrument module: {module}\n{ex}");
                         _instrumentationHelper.RestoreOriginalModule(module, _identifier);
                     }
                 }

src/coverlet.core/Instrumentation/Instrumenter.cs

@@ -123,7 +123,7 @@ public bool CanInstrument()
             }
             catch (Exception ex)
             {
-                _logger.LogWarning($"Unable to instrument module: '{_module}' because : {ex.Message}");
+                _logger.LogWarning($"Unable to instrument module: '{_module}'\n{ex}");
                 return false;
             }
         }