Vendor dependencies

Let's see how I like this workflow.

vendor/chrono/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"
+name = "chrono"
+version = "0.4.23"
+exclude = ["/ci/*"]
+description = "Date and time library for Rust"
+homepage = "https://github.com/chronotope/chrono"
+documentation = "https://docs.rs/chrono/"
+readme = "README.md"
+keywords = [
+    "date",
+    "time",
+    "calendar",
+]
+categories = ["date-and-time"]
+license = "MIT/Apache-2.0"
+repository = "https://github.com/chronotope/chrono"
+
+[package.metadata.docs.rs]
+features = ["serde"]
+rustdoc-args = [
+    "--cfg",
+    "docsrs",
+]
+
+[package.metadata.playground]
+features = ["serde"]
+
+[lib]
+name = "chrono"
+
+[[bench]]
+name = "chrono"
+harness = false
+required-features = ["__internal_bench"]
+
+[[bench]]
+name = "serde"
+harness = false
+required-features = [
+    "__internal_bench",
+    "serde",
+]
+
+[dependencies.arbitrary]
+version = "1.0.0"
+features = ["derive"]
+optional = true
+
+[dependencies.criterion]
+version = "0.4.0"
+optional = true
+
+[dependencies.iana-time-zone]
+version = "0.1.44"
+features = ["fallback"]
+optional = true
+
+[dependencies.num-integer]
+version = "0.1.36"
+default-features = false
+
+[dependencies.num-traits]
+version = "0.2"
+default-features = false
+
+[dependencies.pure-rust-locales]
+version = "0.5.2"
+optional = true
+
+[dependencies.rkyv]
+version = "0.7"
+optional = true
+
+[dependencies.rustc-serialize]
+version = "0.3.20"
+optional = true
+
+[dependencies.serde]
+version = "1.0.99"
+optional = true
+default-features = false
+
+[dependencies.time]
+version = "0.1.43"
+optional = true
+
+[dev-dependencies.bincode]
+version = "1.3.0"
+
+[dev-dependencies.doc-comment]
+version = "0.3"
+
+[dev-dependencies.num-iter]
+version = "0.1.35"
+default-features = false
+
+[dev-dependencies.serde_derive]
+version = "1"
+default-features = false
+
+[dev-dependencies.serde_json]
+version = "1"
+
+[features]
+__doctest = []
+__internal_bench = ["criterion"]
+alloc = []
+clock = [
+    "std",
+    "winapi",
+    "iana-time-zone",
+]
+default = [
+    "clock",
+    "std",
+    "oldtime",
+    "wasmbind",
+]
+libc = []
+oldtime = ["time"]
+std = []
+unstable-locales = [
+    "pure-rust-locales",
+    "alloc",
+]
+wasmbind = [
+    "wasm-bindgen",
+    "js-sys",
+]
+
+[target."cfg(all(target_arch = \"wasm32\", not(any(target_os = \"emscripten\", target_os = \"wasi\"))))".dependencies.js-sys]
+version = "0.3"
+optional = true
+
+[target."cfg(all(target_arch = \"wasm32\", not(any(target_os = \"emscripten\", target_os = \"wasi\"))))".dependencies.wasm-bindgen]
+version = "0.2"
+optional = true
+
+[target."cfg(all(target_arch = \"wasm32\", not(any(target_os = \"emscripten\", target_os = \"wasi\"))))".dev-dependencies.wasm-bindgen-test]
+version = "0.3"
+
+[target."cfg(windows)".dependencies.winapi]
+version = "0.3.0"
+features = [
+    "std",
+    "minwinbase",
+    "minwindef",
+    "timezoneapi",
+]
+optional = true