Bump GitHub workflow actions (#67)

Fix typo

.github/workflows/test.yml

@@ -22,15 +22,15 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        go-version: ["1.13", "1.14", "1.15"]
+        go-version: ["1.13", "1.21", "1.22", "1.23"]
     steps:
       - name: Install Go
-        uses: actions/setup-go@v2
+        uses: actions/setup-go@v5
         with:
           go-version: ${{ matrix.go-version }}
       - name: Checkout code
-        uses: actions/checkout@v2
-      - uses: actions/cache@v2
+        uses: actions/checkout@v4
+      - uses: actions/cache@v4
         with:
           path: ~/go/pkg/mod
           key: go-${{ hashFiles('**/go.sum') }}

README.md

@@ -33,7 +33,7 @@ Go-Colorful stores colors in RGB and provides methods from converting these to v
 - **CIE-L\*C\*h° (HCL):** This is generally the [most useful](http://vis4.net/blog/posts/avoid-equidistant-hsv-colors/) one; CIE-L\*a\*b\* space in polar coordinates, i.e. a *better* HSV. H° is in [0..360], C\* almost in [0..1] and L\* as in CIE-L\*a\*b\*.
 - **CIE LCh(uv):** Called `LuvLCh` in code, this is a cylindrical transformation of the CIE-L\*u\*v\* color space. Like HCL above: H° is in [0..360], C\* almost in [0..1] and L\* as in CIE-L\*u\*v\*.
 - **HSLuv:** The better alternative to HSL, see [here](https://www.hsluv.org/) and [here](https://www.kuon.ch/post/2020-03-08-hsluv/). Hue in [0..360], Saturation and Luminance in [0..1].
-- **HPLuv:** A variant of HSLuv. The color space is smoother, but only pastel colors can be included. Because the valid colors are limited, it's easy to get invalid Saturation values way above 1.0, indicating the color can't be represented in HPLuv beccause it's not pastel.
+- **HPLuv:** A variant of HSLuv. The color space is smoother, but only pastel colors can be included. Because the valid colors are limited, it's easy to get invalid Saturation values way above 1.0, indicating the color can't be represented in HPLuv because it's not pastel.
 
 For the colorspaces where it makes sense (XYZ, Lab, Luv, HCl), the
 [D65](http://en.wikipedia.org/wiki/Illuminant_D65) is used as reference white