Bump heist version in default template

project_template/default/foo.cabal

@@ -25,7 +25,7 @@ Executable projname
   Build-depends:
     base >= 4 && < 5,
     bytestring >= 0.9.1 && < 0.10,
-    heist >= 0.3 && < 0.4,
+    heist >= 0.4 && < 0.5,
     hexpat >= 0.19 && < 0.20,
     MonadCatchIO-transformers >= 0.2.1 && < 0.3,
     mtl >= 2 && < 3,