bump project to 0.4.0

Author: lazyoracle

pyproject.toml

@@ -2,7 +2,7 @@
 name = "isotropic"
 authors = [
     { name = "Anurag Saha Roy", email = "contact@anuragsaharoy.me"}]
-version = "0.3.0"
+version = "0.4.0"
 license = "Apache-2.0"
 description = "Analysis of isotropic errors in QC algorithms"
 readme = "README.md"