Use version from generated cabal Paths module

ShellCheck.cabal

@@ -42,6 +42,8 @@ library
       ShellCheck.Data
       ShellCheck.Parser
       ShellCheck.Simple
+    other-modules:
+      Paths_ShellCheck
 
 executable shellcheck
     build-depends:
@@ -54,3 +56,4 @@ executable shellcheck
       parsec,
       regex-compat
     main-is: shellcheck.hs
+

ShellCheck/Data.hs

@@ -1,6 +1,9 @@
 module ShellCheck.Data where
 
-shellcheckVersion = "0.3.2"  -- Must also be updated in ShellCheck.cabal
+import Data.Version (showVersion)
+import Paths_ShellCheck (version)
+
+shellcheckVersion = showVersion version
 
 internalVariables = [
     -- Generic