Remove C# 6.0 nameof operator usage

Author: TomGillen

GitVersionCore/IncrementStrategyFinder.cs

@@ -57,7 +57,7 @@ private static VersionField SimpleIncrement(IncrementStrategy strategy)
                 case IncrementStrategy.Patch:
                     return VersionField.Patch;
                 default:
-                    throw new ArgumentOutOfRangeException(nameof(strategy), strategy, null);
+                    throw new ArgumentOutOfRangeException("strategy", strategy, null);
             }
         }