Chapter 4: link to Google Code issue with WordNet synset bug is broken

[pjhinton]

The Google Code issue referenced in Chapter 4:

http://code.google.com/p/nltk/issues/detail?id=297

is no longer retrievable. Google displays the following error messages on the page where the issue history should appear.

There was an error obtaining the issue:

{"data":"Anonymous caller does not have storage.objects.get access to google-code-archive/v2/code.google.com/nltk/issues/issue-297.json.","status":401,"config":{"method":"GET","transformRequest":[null],"transformResponse":[null],"jsonpCallbackParam":"callback","url":"https://www.googleapis.com/storage/v1/b/google-code-archive/o/v2%2Fcode.google.com%2Fnltk%2Fissues%2Fissue-297.json?alt=media","params":{"stripTrailingSlashes":false},"headers":{"Accept":"application/json, text/plain, */*"}},"statusText":""}

I don't think issues were migrated from Google Code to Github, or if they were, it was in a non-obvious fashion. The Git changeset that contains the relevant code change may be found here:

https://github.com/nltk/nltk/commit/6e86c1da654eada1b5669fb32af4e011d6359c48#diff-77e881f13b047e553238729053bf5001

[rupsaijna]

I suppose all such links should be marked as dead/expired henceforth?