Patch version bump for lambda-http 0.8.4 (#1039)

Author: PartiallyUntyped

lambda-http/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "lambda_http"
-version = "0.8.3"
+version = "0.8.4"
 authors = [
     "David Calavera <[email protected]>",
     "Harold Sun <[email protected]>",