Add text color classes

sass/base/helpers.sass

@@ -59,6 +59,15 @@ $displays: 'block' 'flex' 'inline' 'inline-block' 'inline-flex'
 .has-text-right
   text-align: right
 
+@each $name, $pair in $colors
+  $color: nth($pair, 1)
+  .has-text-#{$name}
+    color: $color
+  a.has-text-#{$name}
+    &:hover,
+    &:focus
+      color: darken($color, 10%)
+
 // Visibility
 
 .is-hidden