Fixed regression test
Fixed regression test

no issue

- html to plaintext was broken with https://github.com/TryGhost/Ghost/commit/c219446f85a82ea4e5a8344e564f7025129452c0 . Ghost's API supports html intpu format only for version above v8

Kikobeats/Ghost,Gargol/Ghost,kevinansfield/Ghost,TryGhost/Ghost,bitjson/Ghost,ErisDS/Ghost,ErisDS/Ghost,JohnONolan/Ghost,janvt/Ghost,ErisDS/Ghost,Gargol/Ghost,kevinansfield/Ghost,JohnONolan/Ghost,e10/Ghost,e10/Ghost,bitjson/Ghost,kevinansfield/Ghost,JohnONolan/Ghost,TryGhost/Ghost,TryGhost/Ghost,Kikobeats/Ghost,janvt/Ghost,Kikobeats/Ghost