Fix typo in "Using the pipe syntax" examples

The import of Dataframes was missing the "s" at the end.

README.md

@@ -127,15 +127,15 @@ save(f::FileIO.File{FileIO.format"CSV"}, data; delim=',', quotechar='"', escapec
 Both ``load`` and ``save`` also support the pipe syntax. For example, to load a CSV file into a ``DataFrame``, one can use the following code:
 
 ````julia
-using CSVFiles, DataFrame
+using CSVFiles, DataFrames
 
 df = load("data.csv") |> DataFrame
 ````
 
 To save an iterable table, one can use the following form:
 
 ````julia
-using CSVFiles, DataFrame
+using CSVFiles, DataFrames
 
 df = # Aquire a DataFrame somehow