Making backing vectors readonly.

src/ImageSharp/Colors/Spaces/Bgra32.cs

@@ -22,7 +22,7 @@ namespace ImageSharp.Colors.Spaces
         /// <summary>
         /// The backing vector for SIMD support.
         /// </summary>
-        private Vector4 backingVector;
+        private readonly Vector4 backingVector;
 
         /// <summary>
         /// Initializes a new instance of the <see cref="Bgra32"/> struct.

src/ImageSharp/Colors/Spaces/CieLab.cs

@@ -28,7 +28,7 @@ namespace ImageSharp.Colors.Spaces
         /// <summary>
         /// The backing vector for SIMD support.
         /// </summary>
-        private Vector3 backingVector;
+        private readonly Vector3 backingVector;
 
         /// <summary>
         /// Initializes a new instance of the <see cref="CieLab"/> struct.

src/ImageSharp/Colors/Spaces/CieXyz.cs

@@ -28,7 +28,7 @@ namespace ImageSharp.Colors.Spaces
         /// <summary>
         /// The backing vector for SIMD support.
         /// </summary>
-        private Vector3 backingVector;
+        private readonly Vector3 backingVector;
 
         /// <summary>
         /// Initializes a new instance of the <see cref="CieXyz"/> struct.

src/ImageSharp/Colors/Spaces/Cmyk.cs

@@ -27,7 +27,7 @@ namespace ImageSharp.Colors.Spaces
         /// <summary>
         /// The backing vector for SIMD support.
         /// </summary>
-        private Vector4 backingVector;
+        private readonly Vector4 backingVector;
 
         /// <summary>
         /// Initializes a new instance of the <see cref="Cmyk"/> struct.

src/ImageSharp/Colors/Spaces/Hsl.cs

@@ -27,7 +27,7 @@ namespace ImageSharp.Colors.Spaces
         /// <summary>
         /// The backing vector for SIMD support.
         /// </summary>
-        private Vector3 backingVector;
+        private readonly Vector3 backingVector;
 
         /// <summary>
         /// Initializes a new instance of the <see cref="Hsl"/> struct.

src/ImageSharp/Colors/Spaces/Hsv.cs

@@ -27,7 +27,7 @@ namespace ImageSharp.Colors.Spaces
         /// <summary>
         /// The backing vector for SIMD support.
         /// </summary>
-        private Vector3 backingVector;
+        private readonly Vector3 backingVector;
 
         /// <summary>
         /// Initializes a new instance of the <see cref="Hsv"/> struct.

src/ImageSharp/Colors/Spaces/YCbCr.cs

@@ -23,7 +23,7 @@ namespace ImageSharp.Colors.Spaces
         /// <summary>
         /// The backing vector for SIMD support.
         /// </summary>
-        private Vector3 backingVector;
+        private readonly Vector3 backingVector;
 
         /// <summary>
         /// Initializes a new instance of the <see cref="YCbCr"/> struct.