Add Cure earth's birthday

c.f. http://www.toei-anim.co.jp/tv/precure/character/chara9.php#charaarea

README.md

@@ -708,12 +708,12 @@ Cure.cosmo.name
 => true
 
 >> Precure.all_girls.select(&:have_birthday?).map(&:human_name)
-=> ["美墨なぎさ", "雪城ほのか", "九条ひかり", "日向咲", "美翔舞", "相田マナ", "菱川六花", "四葉ありす", "剣崎真琴", "春野はるか", "海藤みなみ", "天ノ川きらら", "紅城トワ", "朝日奈みらい", "十六夜リコ", "宇佐美いちか", "有栖川ひまり", "立神あおい", "琴爪ゆかり", "剣城あきら", "キラ星シエル", "野乃はな", "薬師寺さあや", "輝木ほまれ", "愛崎えみる", "ルールー・アムール", "星奈ひかる", "羽衣ララ", "天宮えれな", "香久矢まどか", "ユニ", "花寺のどか", "沢泉ちゆ", "平光ひなた"]
+=> ["美墨なぎさ", "雪城ほのか", "九条ひかり", "日向咲", "美翔舞", "相田マナ", "菱川六花", "四葉ありす", "剣崎真琴", "春野はるか", "海藤みなみ", "天ノ川きらら", "紅城トワ", "朝日奈みらい", "十六夜リコ", "宇佐美いちか", "有栖川ひまり", "立神あおい", "琴爪ゆかり", "剣城あきら", "キラ星シエル", "野乃はな", "薬師寺さあや", "輝木ほまれ", "愛崎えみる", "ルールー・アムール", "星奈ひかる", "羽衣ララ", "天宮えれな", "香久矢まどか", "ユニ", "花寺のどか", "沢泉ちゆ", "平光ひなた", "風鈴アスミ"]
 >> Precure.all_girls.select(&:have_birthday?).sort_by { |girl| Date.parse(girl.birthday) }.map{ |girl| [girl.birthday, girl.human_name]  }
-=> [["1/7", "宇佐美いちか"], ["1/20", "野乃はな"], ["3/9", "花寺のどか"], ["4/4", "雪城ほのか"], ["4/8", "輝木ほまれ"], ["4/10", "春野はるか"], ["4/12", "星奈ひかる"], ["4/16", "有栖川ひまり"], ["5/28", "四葉ありす"], ["6/10", "薬師寺さあや"], ["6/11", "琴爪ゆかり"], ["6/12", "朝日奈みらい"], ["7/7", "羽衣ララ"], ["7/15", "愛崎えみる"], ["7/20", "海藤みなみ"], ["7/30", "キラ星シエル"], ["8/4", "相田マナ"], ["8/7", "日向咲"], ["8/21", "沢泉ちゆ"], ["8/27", "立神あおい"], ["9/8", "天宮えれな"], ["9/9", "九条ひかり"], ["9/12", "天ノ川きらら"], ["9/17", "菱川六花"], ["9/23", "ルールー・アムール"], ["9/24", "剣城あきら"], ["10/4", "平光ひなた"], ["10/10", "美墨なぎさ"], ["10/11", "ユニ"], ["11/4", "剣崎真琴"], ["11/12", "十六夜リコ"], ["11/20", "美翔舞"], ["11/23", "香久矢まどか"], ["12/15", "紅城トワ"]]
+=> [["1/7", "宇佐美いちか"], ["1/20", "野乃はな"], ["3/9", "花寺のどか"], ["4/4", "雪城ほのか"], ["4/8", "輝木ほまれ"], ["4/10", "春野はるか"], ["4/12", "星奈ひかる"], ["4/16", "有栖川ひまり"], ["5/28", "四葉ありす"], ["6/10", "薬師寺さあや"], ["6/11", "琴爪ゆかり"], ["6/12", "朝日奈みらい"], ["7/7", "羽衣ララ"], ["7/15", "愛崎えみる"], ["7/20", "海藤みなみ"], ["7/30", "キラ星シエル"], ["8/4", "相田マナ"], ["8/7", "日向咲"], ["8/16", "風鈴アスミ"], ["8/21", "沢泉ちゆ"], ["8/27", "立神あおい"], ["9/8", "天宮えれな"], ["9/9", "九条ひかり"], ["9/12", "天ノ川きらら"], ["9/17", "菱川六花"], ["9/23", "ルールー・アムール"], ["9/24", "剣城あきら"], ["10/4", "平光ひなた"], ["10/10", "美墨なぎさ"], ["10/11", "ユニ"], ["11/4", "剣崎真琴"], ["11/12", "十六夜リコ"], ["11/20", "美翔舞"], ["11/23", "香久矢まどか"], ["12/15", "紅城トワ"]]
 
 >> Precure.all_girls.select(&:have_birthday?).map(&:human_name).count
-=> 34
+=> 35
 ```
 
 * `has_birthday?` is alias to `have_birthday?`

config/girls/017_healingood.yml

@@ -98,7 +98,7 @@ cure_earth: &cure_earth
   cast_name:    三森すずこ
   color:        purple
   created_date: 2020-08-09 # episode 19
-  # birthday:
+  birthday: 8/16
   transform_message: |-
     スタート！
     プリキュアオペレーション！