Merge branch 'prettier-html' into 'master'

__tests__/files/outlook-outlook/chrome/21/r_htmlContent.html

__tests__/files/outlook-outlook/chrome/21/s_htmlContent.html

...files/outlook-outlook/chrome/21forward/r_htmlContent.html

...files/outlook-outlook/chrome/21forward/s_htmlContent.html

..._/files/outlook-outlook/chrome/21reply/r_htmlContent.html

..._/files/outlook-outlook/chrome/21reply/s_htmlContent.html

__tests__/files/outlook-outlook/chrome/22/r_htmlContent.html

__tests__/files/outlook-outlook/chrome/22/s_htmlContent.html

__tests__/files/outlook-outlook/chrome/23/r_htmlContent.html

__tests__/files/outlook-outlook/chrome/23/s_htmlContent.html

__tests__/files/outlook-outlook/chrome/24/r_htmlContent.html

__tests__/files/outlook-outlook/chrome/24/s_htmlContent.html

__tests__/files/outlook-outlook/chrome/25/r_htmlContent.html

__tests__/files/outlook-outlook/chrome/25/s_htmlContent.html

__tests__/files/outlook-outlook/chrome/26/r_htmlContent.html

__tests__/files/outlook-outlook/chrome/26/s_htmlContent.html

__tests__/files/outlook-outlook/chrome/28/r_htmlContent.html

__tests__/files/outlook-outlook/chrome/28/s_htmlContent.html

__tests__/files/outlook-outlook/edge/01/r_htmlContent.html

__tests__/files/outlook-outlook/edge/01/s_htmlContent.html