Fix linkify to only match valid URI characters

Fixes IonicaBizau#63

It handles the fact that escapeForHtml has already been called and
matches `&` separately.

I used the RFC (basically the last 5 rules) from:
https://datatracker.ietf.org/doc/html/rfc3986#appendix-A

Author: perlpunk

DOCUMENTATION.md

@@ -20,8 +20,7 @@ be run prior to `ansiToHtml`.
 Adds the links in the HTML.
 
 This replaces any links in the text with anchor tags that display the
-link. The links should have at least one whitespace character
-surrounding it. Also, you should apply this after you have run
+link. You should apply this after you have run
 `ansiToHtml` on the text.
 
 #### Params

lib/index.js

@@ -24,6 +24,7 @@ const ANSI_COLORS = [
       , { color: "255, 255, 255",  "class": "ansi-bright-white"   }
     ]
 ];
+const linkRegex = /(https?:\/\/(?:[A-Za-z0-9#;/?:@=+$',_.!~*()[\]-]|&|%[A-Ea-a0-9]{2})+)/gm;
 
 class Anser {
 
@@ -49,9 +50,7 @@ class Anser {
      * Adds the links in the HTML.
      *
      * This replaces any links in the text with anchor tags that display the
-     * link. The links should have at least one whitespace character
-     * surrounding it. Also, you should apply this after you have run
-     * `ansiToHtml` on the text.
+     * link. You should apply this after you have run `ansiToHtml` on the text.
      *
      * @name Anser.linkify
      * @function
@@ -196,7 +195,7 @@ class Anser {
      * @returns {String} The HTML output containing link elements.
      */
     linkify (txt) {
-        return txt.replace(/(https?:\/\/[^\s]+)/gm, str => `<a href="${str}">${str}</a>`);
+        return txt.replace(linkRegex, str => `<a href="${str}">${str}</a>`);
     }
 
     /**