This example is a simple web crawler that finds all anchor tags in a web page and
follows the links to get to other pages. After a predefined number of pages are
fetched, it creates a graph of the pages using graphviz.
The crawler only fetches URLs that are of the form github.com/user/repo. Here is
a graph generated by this program starting from
https://github.com/topics/go limited to 200 URLs: