Add tld support behind options flag (#7)

The options flag is { tld: true }. This PR will also create a more modern solution to packaging by using microbundle

README.md

@@ -53,6 +53,22 @@ extractDomain(urls); // [ 'npmjs.com', 'example.com', 'example.com', 'npmjs.com'
 
 ```
 
+TLD support
+--
+```js
+const url = 'http://www.example.co.uk:80/path/to/myfile.html?key1=value1&key2=value2#SomewhereInTheDocument';
+
+extractDomain(url, { tld: true });
+// example.co.uk
+```
+However, using the tld flag will slow down the process by many seconds. Benchmark:
+```
+# extract domain 10,000 times
+  end ~14 ms (0 s + 13572914 ns)
+# extract domain with tld 10,000 times
+  end ~4.29 s (4 s + 288108681 ns)
+```
+
 Tests
 --
 ```bash

benchmark.js

@@ -1,9 +1,9 @@
 const bench = require('nanobench');
-const extractDomainDist = require('./dist/extract-domain.min');
+const extractDomainDist = require('./dist/extract-domain');
 const extractDomain = require('./index');
 const url = 'https://www.npmjs.com/package/extract-domain';
 
-const times = 2500000;
+const times = 10000;
 
 const timesToLocale = times.toLocaleString();
 
@@ -45,6 +45,16 @@ bench(`extract domain ${timesToLocale} times`, b => {
     b.end();
 });
 
+bench(`extract domain with tld ${timesToLocale} times`, b => {
+    b.start();
+
+    for (let i = 0; i < times; i++) {
+        extractDomain(url, { tld: true }) === 'npmjs.com';
+    }
+
+    b.end();
+});
+
 bench(`extract domain regex ${timesToLocale} times`, b => {
     b.start();