Update version to reflect new versioning scheme

package.yaml

 name:                decker
-version:             0.4.0.0
+version:             0.4.1
 license:             OtherLicense
 author:              "Henrik Tramberend"
 maintainer:          "henrik.tramberend@beuth-hochschule.de"

readme.md

@@ -159,7 +159,9 @@ Exchange the `html` at the end of the command with your *decker* command of choi
 ### Pull requests
 
 Contributions are accepted via pull requests. Before working on a feature,
-please write up an issue and discuss it with the other developers.
+please write up an issue and discuss it with the other developers. 
+For each implemented feature, increment the version number in `package.yaml`. 
+Breaking changes increment the second number. Fixes increment the third number.
 
 ### CI build checks
 

src/Common.hs

@@ -30,11 +30,11 @@ import Paths_decker (version)
 deckerVersion :: String
 deckerVersion = showVersion version
 
--- | Is this a developement version? Development versions have 4 branches, and
--- the 4th branch number is always 0. Release branches have only three.
+-- | Is this a developement version? Production versions have 3 branches, and
+-- the 3rd branch number is always 0.
 isDevelopmentVersion :: Bool
 isDevelopmentVersion =
-  (length $ versionBranch version) == 4 && (versionBranch version) !! 3 == 0
+  (length $ versionBranch version) == 3 && (versionBranch version) !! 2 == 0
 
 -- | Tool specific exceptions
 data DeckerException