Merge pull request dbt-labs#302 from fishtown-analytics/update/date-s…

…pine-ex-code

Cross-db-compatible example date_spine code in readme

README.md

@@ -100,9 +100,9 @@ This macro returns the sql required to build a date spine. The spine will includ
 Usage:
 ```
 {{ dbt_utils.date_spine(
-    datepart="minute",
-    start_date="to_date('01/01/2016', 'mm/dd/yyyy')",
-    end_date="dateadd(week, 1, current_date)"
+    datepart="day",
+    start_date="cast('2019-01-01' as date)",
+    end_date="cast('2020-01-01' as date)"
    )
 }}
 ```