Robuta

https://lists.wikimedia.org/hyperkitty/list/pywikibot-commits@lists.wikimedia.org/thread/NKFX6G2BMYWRA4T25FKYPBU7AXITRVRO/ [Gerrit] ...core[master]: tests: Replace assertRaises with assertRaisesRegex in proofreadpage_t...... gerrit core master tests replace