Bump version to 0.4.0

Minor version change for the breaking change in the public API of Plugin (now uses HashSet instead of Vec for cells and worlds).

Cargo.lock

@@ -241,7 +241,7 @@ dependencies = [
 
 [[package]]
 name = "skyrim-cell-dump"
-version = "0.3.4"
+version = "0.4.0"
 dependencies = [
  "anyhow",
  "argh",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "skyrim-cell-dump"
-version = "0.3.4"
+version = "0.4.0"
 edition = "2018"
 authors = ["Tyler Hallada <tyler@hallada.net>"]
 description = "Library and binary for parsing Skyrim plugin files and extracting CELL data"