fix: 修正分页、分割线正则的一点问题

src/utils/block-type-regs.js

@@ -13,9 +13,9 @@ blockTypeRegs.h6 = new RegExp(/^######\s/)
 
 blockTypeRegs.blockquote = new RegExp(/^>\s/)
 
-blockTypeRegs.hr = new RegExp(/---/)
+blockTypeRegs.hr = new RegExp(/^---$/)
 
-blockTypeRegs.slideBreak = new RegExp(/====/)
+blockTypeRegs.slideBreak = new RegExp(/^====$/)
 
 blockTypeRegs.pre = new RegExp(/^```([\\s\\S]*?)```$/)