doc: fix typo: depreciated -> deprecated (#680)

https://stackoverflow.com/questions/9208091/the-difference-between-deprecated-depreciated-and-obsolete#answer-9208164

Author: jacobq

CHANGELOG.md

@@ -1,7 +1,7 @@
 8.0.0 / 2019-05-11
 ------------------
 
-**NOTE:** Node.js v6 support is depreciated, and will be dropped in the next major release.
+**NOTE:** Node.js v6 support is deprecated, and will be dropped in the next major release.
 
 - Use `renameSync()` under the hood in `moveSync()`
 - Fix bug with bind-mounted directories in `copy*()` ([#613](https://github.com/jprichardson/node-fs-extra/issues/613), [#618](https://github.com/jprichardson/node-fs-extra/pull/618))