Update README.md

Author: ospillinger

README.md

@@ -8,10 +8,12 @@
 
 <br>
 
-## Machine learning pipelines as code
+## Deploy, manage, and scale machine learning applications
 
 Deploy machine learning applications without worrying about setting up infrastructure, managing dependencies, or orchestrating data pipelines.
 
+Cortex is actively maintained by Cortex Labs. We're a venture-backed team of infrastructure engineers and [we're hiring](https://angel.co/cortex-labs-inc/jobs).
+
 <br>
 
 ## How it works
@@ -37,6 +39,16 @@ Deploy machine learning applications without worrying about setting up infrastru
     schema: [@col1, @col2, ...]
 ```
 
+**Data validation:** prevent data quality issues early.
+
+```yaml
+- kind: raw_column
+  name: col1
+  type: INT_COLUMN
+  min: 0
+  max: 10
+```
+
 **Data transformation:** use custom Python and PySpark code to transform data.
 
 ```yaml