dbt Hamilton example update requirements and readme

examples/dbt/README.md

@@ -28,7 +28,7 @@ To run the example, you'll need to do two things:
 ```bash
 # Using pypi
 $ cd examples/dbt
-$ pip install - r requirements.txt
+$ pip install -r requirements.txt
 ```
 2. Execute!
 ```bash

examples/dbt/requirements.txt

@@ -1,6 +1,7 @@
-dbt
+dbt-core
 dbt-duckdb
 dbt-fal
 dbt-python
+pandera
 scikit-learn
 sf-hamilton