remove cache from canopy_height chunk

Author: dlebauer

traits/03-access-r-traits.Rmd

@@ -78,7 +78,7 @@ sorghum_info <- betydb_query(table = 'species',
 ### Time series of height
 
 Now let's query some trait data.
-```{r canopy_height, echo = TRUE, results = FALSE, cache = TRUE}
+```{r canopy_height, echo = TRUE, results = FALSE}
 sorghum_height <- betydb_query(table     = 'search',
                                trait     = "canopy_height",
                                sitename  = "~Season 6",