add attribution

Author: boshek

NEWS.md

@@ -1,4 +1,6 @@
+# tidyhydat 0.6.2
 - fix bug where `download_hydat()` fails if `tempdir()` is on a different device than `hydat_path` (@mpdavison, #192)
+- fix bug where `download_hydat()` wasn't checking alternative paths for success (@Travis-Simmons)
 
 # tidyhydat 0.6.1
 - Add `...` to print methods so you can pass arguments all the way down.