v0.6.1

Features:

• CommonMark compliant CodeFence (#41);
• allow multiple backticks for InlineCode;
• strips whitespace around InlineCode;

Fixed:

• Separator needs at least three characters;
• indented code blocks should not interrupt paragraphs (#40, thanks @joncass);
• crashes when sublists have different marker type (#42, thanks @JBartlett86);
• typo in Paragraph.read (#43, thanks @NatTupper);
• preliminary fixes for handling loose lists (#44, thanks @huettenhain);
• removed corrupted block_token.until function;
• html code language tags starts with "language-".