Fix typo in godoc
diff --git a/decode.go b/decode.go
index e7f1259..8bab5bd 100644
--- a/decode.go
+++ b/decode.go
@@ -143,7 +143,7 @@
 	}
 }
 
-// Reader is an io.Reader than can read Snappy-compressed bytes.
+// Reader is an io.Reader that can read Snappy-compressed bytes.
 type Reader struct {
 	r       io.Reader
 	err     error