Fix text garbling in Japanese

[funwarioisii]

What

I fix text garbling in Japanese.

Now:

irb(main):004> OpenGraph.new("https://www.youtube.com/watch?v=w1JPVRwNhaE").title
=> "ã\u0080\u0090ã\u0081©ã\u0081\u0093è¡\u008Cã\u0081\u008Fï¼\u009Fã\u0080\u00913æ\u0099\u0082é\u0096\u0093以å\u0086\u0085ã\u0081«æ\u009C\u0080é«\u0098ã\u0081®çµ¶æ\u0099¯ã\u0082\u0092æ\u0092®å½±ã\u0081\u0097ã\u0081¦å¸°ã\u0081£ã\u0081¦ã\u0081\u0093ã\u0081\u0084ï¼\u0081é\u0081¸æ\u0089\u008B権"

After patched:

irb(main):003> OpenGraph.new("https://www.youtube.com/watch?v=w1JPVRwNhaE").title
=> "【どこ行く？】3時間以内に最高の絶景を撮影して帰ってこい！選手権"

--

Sorry, I'm still investigating why this happened.
However, I believe it has something to do with https://github.com/sparklemotion/nokogiri/releases/tag/v1.15.0.