Vendor dependencies

Let's see how I like this workflow.

vendor/iana-time-zone/Cargo.toml

@@ -0,0 +1,65 @@
+# 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 = "iana-time-zone"
+version = "0.1.53"
+authors = [
+    "Andrew Straw <strawman@astraw.com>",
+    "René Kijewski <rene.kijewski@fu-berlin.de>",
+    "Ryan Lopopolo <rjl@hyperbo.la>",
+]
+description = "get the IANA time zone for the current system"
+readme = "README.md"
+keywords = [
+    "IANA",
+    "time",
+]
+categories = [
+    "date-and-time",
+    "internationalization",
+    "os",
+]
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/strawlab/iana-time-zone"
+
+[features]
+fallback = []
+
+[target."cfg(any(target_os = \"macos\", target_os = \"ios\"))".dependencies.core-foundation-sys]
+version = "0.8.3"
+
+[target."cfg(target_arch = \"wasm32\")".dependencies.js-sys]
+version = "0.3.50"
+
+[target."cfg(target_arch = \"wasm32\")".dependencies.wasm-bindgen]
+version = "0.2.70"
+
+[target."cfg(target_arch = \"wasm32\")".dev-dependencies.wasm-bindgen-test]
+version = "0.3"
+
+[target."cfg(target_os = \"android\")".dependencies.android_system_properties]
+version = "0.1.5"
+
+[target."cfg(target_os = \"haiku\")".dependencies.iana-time-zone-haiku]
+version = "0.1.1"
+
+[target."cfg(target_os = \"windows\")".dependencies.winapi]
+version = "0.3.9"
+features = [
+    "activation",
+    "combaseapi",
+    "objbase",
+    "roapi",
+    "winerror",
+    "winstring",
+]