Issue #2819097 by claudiu.cristea: Allow more generic configurations. Typo.

README.md

@@ -60,7 +60,7 @@ source:
   # composing the primary key. The list is keyed by column name and has the
   # field schema as value. If the table have a header (i.e. `header_row` is set)
   # the keys will be set ad the name of header cells acting as primary index.
-  # Otherwide the column letters (A, B, C, ...) can be used. If no keys are
+  # Otherwise the column letters (A, B, C, ...) can be used. If no keys are
   # defined, the current row position will be returned as primary key, but in
   # this case, 'row_index_column' should have a value.
   keys: