Document --toastMinHeight

Author: zerodevx

README.md

@@ -107,7 +107,8 @@ In general, use CSS variables - the following (self-explanatory) vars are expose
 
 ._toastItem {
   width: var(--toastWidth, 16rem);
-  height: var(--toastHeight, 3.5rem);
+  height: var(--toastHeight, auto);
+  min-height: var(--toastMinHeight, 3.5rem);
   margin: var(--toastMargin, 0 0 0.5rem 0);
   background: var(--toastBackground, rgba(66,66,66,0.9));
   color: var(--toastColor, #FFF);