bump version to 0.4.1

Author: byorgey

diagrams-pandoc.cabal

@@ -1,6 +1,6 @@
 cabal-version:       3.0
 name:                diagrams-pandoc
-version:             0.4
+version:             0.4.1
 synopsis:            A Pandoc filter to express diagrams inline using the Haskell EDSL _Diagrams_
 description: 'diagrams-pandoc' replaces appropriately marked code
     blocks in pandoc input with images.  The code blocks are compiled