dev-python/ipython: add missing revbump

I didn't revbump in 1f22b2eec0723c5359ec20c03bccf9fdc0d8510f.

Bug: https://bugs.gentoo.org/669926
Package-Manager: Portage-2.3.51, Repoman-2.3.12
RepoMan-Options: --force
Signed-off-by: Louis Sautier <sbraz@gentoo.org>

diff --git a/dev-python/ipython/ipython-5.4.1-r1.ebuild b/dev-python/ipython/ipython-5.4.1-r2.ebuild
similarity index 100%
rename from dev-python/ipython/ipython-5.4.1-r1.ebuild
rename to dev-python/ipython/ipython-5.4.1-r2.ebuild

diff --git a/dev-python/ipython/ipython-5.8.0.ebuild b/dev-python/ipython/ipython-5.8.0-r1.ebuild
similarity index 100%
rename from dev-python/ipython/ipython-5.8.0.ebuild
rename to dev-python/ipython/ipython-5.8.0-r1.ebuild