move code block ticks

Author: orianac

README.md

@@ -42,6 +42,7 @@ You can also use it to validate a Dataset like so:
 schema_ds = DatasetSchema({'foo': schema})
 
 schema_ds.validate(da.to_dataset())
+```
 
 # roadmap
 
@@ -58,4 +59,3 @@ All the code in this repository is [MIT](https://choosealicense.com/licenses/mit
 ## about us
 
 CarbonPlan is a non-profit organization working on the science and data of carbon removal. We aim to improve the transparency and scientific integrity of carbon removal and climate solutions through open data and tools. Find out more at [carbonplan.org](https://carbonplan.org/) or get in touch by [opening an issue](https://github.com/carbonplan/xarray-schema/issues/new) or [sending us an email](mailto:[email protected]).
-```