Bump version to v0.4.0

[ci skip]

Author: github-actions[bot]

Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "indexed_db_futures"
-version = "0.3.0"
+version = "0.4.0"
 authors = ["Arturas Molcanovas <[email protected]>"]
 edition = "2021"
 rust-version = "1.60.0"
@@ -15,6 +15,13 @@ include = [
     "README.md"
 ]
 
+[package.metadata.docs.rs]
+all-features = true
+rustdoc-args = [
+    "--cfg",
+    "doc_cfg",
+]
+
 [features]
 default = [
     "cursors",
@@ -69,10 +76,3 @@ features = [
     "Window",
     "WorkerGlobalScope",
 ]
-
-[package.metadata.docs.rs]
-all-features = true
-rustdoc-args = [
-    "--cfg",
-    "doc_cfg",
-]