Bump to 1.0.4.3 and update changelog

Author: borsboom

ChangeLog.md

@@ -1,5 +1,12 @@
 # Changelog
 
+## 1.0.4.3
+
+Bug fixes
+
+* Don't delete contents of ~/.ssh when using `stack clean --full` with Docker
+  enabled [#2000](https://github.com/commercialhaskell/stack/issues/2000)
+
 ## 1.0.4.2
 
 Build with path-io-1.0.0. There are no changes in behaviour from 1.0.4,

stack.cabal

@@ -1,5 +1,5 @@
 name:                stack
-version:             1.0.4.2
+version:             1.0.4.3
 synopsis:            The Haskell Tool Stack
 description:         Please see the README.md for usage information, and
                      the wiki on Github for more details.  Also, note that