Vendor dependencies

Let's see how I like this workflow.

vendor/tokio-stream/Cargo.toml

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+# 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"
+rust-version = "1.49"
+name = "tokio-stream"
+version = "0.1.11"
+authors = ["Tokio Contributors <team@tokio.rs>"]
+description = """
+Utilities to work with `Stream` and `tokio`.
+"""
+homepage = "https://tokio.rs"
+categories = ["asynchronous"]
+license = "MIT"
+repository = "https://github.com/tokio-rs/tokio"
+
+[package.metadata.docs.rs]
+all-features = true
+rustdoc-args = [
+    "--cfg",
+    "docsrs",
+]
+rustc-args = [
+    "--cfg",
+    "docsrs",
+]
+
+[dependencies.futures-core]
+version = "0.3.0"
+
+[dependencies.pin-project-lite]
+version = "0.2.0"
+
+[dependencies.tokio]
+version = "1.8.0"
+features = ["sync"]
+
+[dependencies.tokio-util]
+version = "0.7.0"
+optional = true
+
+[dev-dependencies.async-stream]
+version = "0.3"
+
+[dev-dependencies.futures]
+version = "0.3"
+default-features = false
+
+[dev-dependencies.parking_lot]
+version = "0.12.0"
+
+[dev-dependencies.tokio]
+version = "1.2.0"
+features = [
+    "full",
+    "test-util",
+]
+
+[features]
+default = ["time"]
+fs = ["tokio/fs"]
+io-util = ["tokio/io-util"]
+net = ["tokio/net"]
+signal = ["tokio/signal"]
+sync = [
+    "tokio/sync",
+    "tokio-util",
+]
+time = ["tokio/time"]
+
+[target."cfg(not(target_arch = \"wasm32\"))".dev-dependencies.proptest]
+version = "1"