{CHANGELOG.md,curry-base.cabal}: Bump upstream version to 0.4.3 (PRE-RELEASE).

CHANGELOG.md

 Change log for curry-frontend
 =============================
 
-Under development (0.4.2)
-=================
+Version (0.4.3)
+===============
+
+  * PRE-RELEASE!!!
+
+Version 0.4.2
+=============
 
   * Improved readability of environment information in dumps
     (option dump-simple)

curry-frontend.cabal

 Name:          curry-frontend
-Version:       0.4.2
+Version:       0.4.3
 Cabal-Version: >= 1.10
 Synopsis:      Compile the functional logic language Curry to several
                intermediate formats
@@ -44,7 +44,7 @@ Library
   Build-Depends:
       base == 4.*
     , containers
-    , curry-base == 0.4.2
+    , curry-base == 0.4.3
     , directory
     , filepath
     , mtl