Fix expectexception install

[znicholls]

Turns out I'm an idiot, this url business isn't needed, see thedataincubator/expectexception#1

Pull request

Please confirm that this pull request has done the following:

• Tests added (N/A)
• Documentation added (where applicable) (N/A)
• Example added (either to an existing notebook or as a new notebook, where applicable) (N/A)
• Description in CHANGELOG.rst added (N/A)

Adding to CHANGELOG.rst

Please add a single line in the changelog notes similar to one of the following:

- (`#XX <http://link-to-pr.com>`_) Added feature which does something
- (`#XX <http://link-to-pr.com>`_) Fixed bug identified in (`#XX <http://link-to-issue.com>`_)

[rgieseke]

No need for self-deprecation! (Why doesn't pip tell one about it ...)

Should this go into master or tidy-up-notebooks?

[znicholls]

Either. I had tidy-up-notebooks because it's got all the other changes too (think of it as a micro commit in the series of changes involved in moving to OpenSCMDataFrame backend, I can't remember why it didn't work off master but for some reason it didn't seem happy)

…

On Thu, Jan 31, 2019 at 5:55 PM Robert Gieseke ***@***.***> wrote: No need for self-deprecation! (Why doesn't pip tell one about it ...) Should this go into master or tidy-up-notebooks? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#206 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AWh-m4DtjOqRQxpCXm1Wtr0DL2MxPeuMks5vIpN8gaJpZM4abFpa> .

[znicholls]

@rgieseke this one's a bit simpler now