print version information on --version

If --version is given, `walint` prints version information, then exists
with code 0.

1 files changed, 4 insertions, 1 deletions

diff --git a/walint.cabal b/walint.cabal
index c189dda..5e12d01 100644
--- a/walint.cabal
+++ b/walint.cabal
@@ -68,6 +68,9 @@ executable walint
                       aeson-pretty,
                       bytestring,
                       mtl,
-                      text
+                      text,
+                      template-haskell,
+                      process
     hs-source-dirs:   src
     default-language: Haskell2010
+    other-modules: Version