Fix a few typos in Color constraint logic

src/Discord.Net.Core/Entities/Roles/Color.cs

@@ -32,11 +32,11 @@ namespace Discord
         }
         public Color(float r, float g, float b)
         {
-            if (r <= 0.0f && r >= 1.0f)
+            if (r < 0.0f || r > 1.0f)
                 throw new ArgumentOutOfRangeException(nameof(r), "A float value must be within [0,1]");
-            if (g <= 0.0f || g >= 1.0f)
+            if (g < 0.0f || g > 1.0f)
                 throw new ArgumentOutOfRangeException(nameof(g), "A float value must be within [0,1]");
-            if (b <= 0.0f || b >= 1.0f)
+            if (b < 0.0f || b > 1.0f)
                 throw new ArgumentOutOfRangeException(nameof(b), "A float value must be within [0,1]");
             RawValue =
                 ((uint)(r * 255.0f) << 16) |