Merge remote-tracking branch 'origin/fix-stack-ghci-ctrl-c-3821'

Author: snoyberg

ChangeLog.md

@@ -147,13 +147,19 @@ Bug fixes:
   resilient against SIGKILL and machine failure. See
   [hackage-security #187](https://github.com/haskell/hackage-security/issues/187)
   and [#3073](https://github.com/commercialhaskell/stack/issues/3073).
+* `stack ghci` now replaces the stack process with ghci. This improves
+  signal handling behavior. In particular, handling of Ctrl-C.  To make
+  this possible, the generated files are now left behind after exit.
+  The paths are based on hashing file contents, and it's stored in the
+  system temporary directory, so this shouldn't result in too much
+  garbage. See
+  [#3821](https://github.com/commercialhaskell/stack/issues/3821).
 
 ## v1.6.3.1
 
 Hackage-only release with no user facing changes (updated to build with
 newer version of hpack dependency).
 
-
 ## v1.6.3
 
 Enhancements: