Stable version 0.4.3

This is purely a bugfix bump that works on GHC 7.6.3,
as currently found in Debian stable and Ubuntu LTS.
diff --git a/ShellCheck.cabal b/ShellCheck.cabal
index f0e92f8..753ff7a 100644
--- a/ShellCheck.cabal
+++ b/ShellCheck.cabal
@@ -1,5 +1,5 @@
 Name:             ShellCheck
-Version:          0.4.2
+Version:          0.4.3
 Synopsis:         Shell script analysis tool
 License:          GPL-3
 License-file:     LICENSE