mention .hex() is lossy (#244)

* docs: Add mention of .hex() being lossy * Update README.md Co-authored-by: Qix <Qix-@users.noreply.github.com>
Qix- · Apr 5, 2022 · 957531f · 957531f
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diff --git a/README.md b/README.md
@@ -57,7 +57,7 @@ Get the rgb number value.
 ```js
 color.hex() // #ffffff
 ```
-Get the hex value.
+Get the hex value. (**NOTE:** `.hex()` does not return alpha values; use `.hexa()` for an RGBA representation)
 
 ```js
 color.red()       // 255

diff --git a/test/index.js b/test/index.js
@@ -512,6 +512,7 @@ it('Translate with channel setters', () => {
 
 it('CSS String getters', () => {
 	equal(Color('rgb(10, 30, 25)').hex(), '#0A1E19');
+	equal(Color('rgb(10, 30, 25, .5)').hex(), '#0A1E19');
 	equal(Color('rgb(10, 30, 25, 1)').hexa(), '#0A1E19FF');
 	equal(Color('rgb(10, 30, 25, 0.4)').hexa(), '#0A1E1966');
 	equal(Color('rgb(10, 30, 25, 0)').hexa(), '#0A1E1900');