[v0.2.3] Feature/support new html format

[kairi003]

「小説家になろう」のHTML構造の変更に対応

Close #4

.index_box -> .p-eplist
.subtitle a -> a.p-eplist__subtitle
.long_update -> .p-eplist__update
.novelview_pager-next -> .c-pager__item--next
.novelview_pager-last -> .c-pager__item--last
chapter_title -> p-eplist__chapter-title
novel_sublist2 -> p-eplist__sublist

"<div id=\"novel_a\" class=\"novel_view\">\n([\\s\\S]+?)</div>" -> "<div class=\"js-novel-text p-novel__text p-novel__text--afterword\">\n([\\s\\S]+?)</div>"
"<div id=\"novel_p\" class=\"novel_view\">\n([\\s\\S]+?)</div>" -> "<div class=\"js-novel-text p-novel__text p-novel__text--preface\">\n([\\s\\S]+?)</div>"
"<p class=\"novel_subtitle\">(.+?)</p>" -> "<h1 class=\"p-novel__title p-novel__title--rensai\">(.+?)</h1>"
"<div id=\"novel_honbun\" class=\"novel_view\">\n([\\s\\S]+?)</div>" -> "<div class=\"js-novel-text p-novel__text\">\n([\\s\\S]+?)</div>"

[kairi003]

checked