Vendor dependencies

Let's see how I like this workflow.

vendor/wasm-bindgen-shared/Cargo.toml

@@ -0,0 +1,25 @@
+# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
+#
+# When uploading crates to the registry Cargo will automatically
+# "normalize" Cargo.toml files for maximal compatibility
+# with all versions of Cargo and also rewrite `path` dependencies
+# to registry (e.g., crates.io) dependencies.
+#
+# If you are reading this file be aware that the original Cargo.toml
+# will likely look very different (and much more reasonable).
+# See Cargo.toml.orig for the original contents.
+
+[package]
+edition = "2018"
+name = "wasm-bindgen-shared"
+version = "0.2.83"
+authors = ["The wasm-bindgen Developers"]
+links = "wasm_bindgen"
+description = """
+Shared support between wasm-bindgen and wasm-bindgen cli, an internal
+dependency.
+"""
+homepage = "https://rustwasm.github.io/wasm-bindgen/"
+documentation = "https://docs.rs/wasm-bindgen-shared"
+license = "MIT/Apache-2.0"
+repository = "https://github.com/rustwasm/wasm-bindgen/tree/master/crates/shared"