feat: refine coverage color scheme

libs/utils/cov-color.js

@@ -2,23 +2,23 @@
  * Generate color from coverage number
  *
  * @param {Number} value
- * @param {Number} orange
- * @param {Number} yellow
  * @param {Number} green
+ * @param {Number} yellow
+ * @param {Number} orange
  */
 
-module.exports = function cc (value, orange = 70, yellow = 85, green = 100) {
-  if (value <= 0) {
+module.exports = function cc (value, green = 100, yellow = 85, orange = 70, red = 35) {
+  if (value < red) {
     return 'red'
   }
   if (value < orange) {
-    return 'ef6c00'
+    return 'orange'
   }
   if (value < yellow) {
-    return 'c0ca33'
+    return 'EEAA22'
   }
   if (value < green) {
-    return 'a4a61d'
+    return '99CC09'
   }
   return 'green'
 }