Release lambda-http 0.9.1 (#777)

Author: bnusunny

lambda-http/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "lambda_http"
-version = "0.9.0"
+version = "0.9.1"
 authors = [
     "David Calavera <[email protected]>",
     "Harold Sun <[email protected]>",