Bump version to 0.8.4+dev

Author: goerz

Project.toml

@@ -1,7 +1,7 @@
 name = "QuantumPropagators"
 uuid = "7bf12567-5742-4b91-a078-644e72a65fc1"
 authors = ["Michael Goerz <mail@michaelgoerz.net>"]
-version = "0.8.3+dev"
+version = "0.8.4+dev"
 
 [deps]
 LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"