v1.3.7

• Pseudocode formatting: #129
• Upgrade to Asciidoctor 2.0.x: #56
• Dumb mid-word apostrophes if document attribute :smartquotes: is off: metanorma/metanorma-itu#115
• Address longstanding bug in rendering of links: malformed generation of introduction titles: #35
• More lax processing of reference codes: metanorma/mn-templates-iso#12