[theme] blockQuote affects only the style of '> ' prefix

[dosmanak]

Observed behavior: Change of style for blockQuote affects only the first few characters on the line Expected behavior for theme.blockQuote is to change style of the whole text.

example:

theme:
  blockQuote: [italic, vividRed, onDullGreen]

$ patat --version
0.8.7.0
Using pandoc: 2.11.2