Refactor to use import map

Closes GH-20.

Reviewed-by: Titus Wormer <tituswormer@gmail.com>

Author: rwe

lib/index.js

@@ -14,7 +14,7 @@
  *   Whether to include positional information.
  */
 
-import {color} from 'unist-util-inspect/do-not-use-conditional-color'
+import {color} from '#conditional-color'
 
 /**
  * Inspect a node, with color in Node, without color in browsers.

package.json

@@ -26,8 +26,10 @@
   "sideEffects": false,
   "type": "module",
   "exports": {
-    ".": "./index.js",
-    "./do-not-use-conditional-color": {
+    ".": "./index.js"
+  },
+  "imports": {
+    "#conditional-color": {
       "node": "./lib/color.node.js",
       "default": "./lib/color.default.js"
     }