Anchor names with underscores show up in titles

[jcoliver]

In episode 2 (and maybe elsewhere) anchors that have an underscore (formatting_pretty and field_name) are showing up in the actual titles. e.g. one title shows up as

Field name problems {#field_name}

but should probably be

Field name

Perhaps replacing the underscores with a dash would fix this? Note the underscores are escaped in the markdown document (e.g. Field name problems {#field\_name}).

[zkamvar]

This was a translation error on my part. @jcoliver, you are correct that the underscores should be replaced by dashes for them to work.

[morskyjezek]

Corrected in PR #142