Feature
* Add hidden fragments ([`510a213`](https://github.com/mcbeet/lectern/commit/510a2131906257893e23e452dee6336dc38a94eb))
Fix
* Report line number in error messages ([`c998d68`](https://github.com/mcbeet/lectern/commit/c998d6877c33a91d6ef6a8f9b5cac8dbd0db53dd))
* Take the backticks into account for code fence start line ([`a2c442c`](https://github.com/mcbeet/lectern/commit/a2c442c628ea1087d8f898b9ff504f627070f2f2))