Lectern

Feature
* Extract and serialize markdown ([`7827d61`](https://github.com/vberlier/lectern/commit/7827d61a9fa298da55e05246c294c2a011750017))
* Implement strip_final_newline modifier ([`9aef7d4`](https://github.com/vberlier/lectern/commit/9aef7d45d0db7b4f7bac667e351b09097e68c2d0))
* Add snapshot testing ([`316e806`](https://github.com/vberlier/lectern/commit/316e8065a59571722cb0a4bdf2fd38912c818111))
* Add load method ([`81953af`](https://github.com/vberlier/lectern/commit/81953af678e6e20237cbc7d689775c144ef51f16))

Fix
* Allow empty modifier ([`c9937b9`](https://github.com/vberlier/lectern/commit/c9937b96e7b9884027f61dfba719d22692a49d67))
* Don't drop modifier ([`8304433`](https://github.com/vberlier/lectern/commit/8304433b592b7dd09ca914fd63084fca8cdbecd4))
* Add newline between loot table and advancement in README ([`7337a70`](https://github.com/vberlier/lectern/commit/7337a70019cd86fa61c33bb212046111419173e8))
* Rename operators to modifiers ([`3886ec3`](https://github.com/vberlier/lectern/commit/3886ec317b66a50ee0935dec5cb1f72eb3582ccc))

Feature
* Plain text extraction and serialization ([`49e8996`](https://github.com/vberlier/lectern/commit/49e8996d3398a8683ea91de3df062e47707574c8))

Fix
* Change document methods and add tests ([`8879b90`](https://github.com/vberlier/lectern/commit/8879b909c00fa5299793ce90db8c1ee81d2af085))