feat(power-assert-formatter): make ambiguous east asian character width configurable
feat(power-assert-formatter): treat ambiguous east asian character as fullwidth (= 2)
chore(power-assert-formatter): use Ricty font for test report area
chore(power-assert-formatter): rebuild web bundle
docs(README): add document for `options.ambiguousEastAsianCharWidth`
Merge pull request #13 from twada/ambiguous-east-asian-width

make ambiguous east asian character width configurable