Vendor dependencies

Let's see how I like this workflow.

vendor/open/Cargo.toml

@@ -0,0 +1,48 @@
+# 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 = "open"
+version = "3.2.0"
+authors = ["Sebastian Thiel <byronimo@gmail.com>"]
+include = [
+    "src/**/*",
+    "LICENSE.md",
+    "README.md",
+    "changelog.md",
+]
+description = "Open a path or URL using the program configured on the system"
+readme = "README.md"
+keywords = [
+    "open",
+    "xdg-open",
+    "start",
+    "launch",
+]
+license = "MIT"
+repository = "https://github.com/Byron/open-rs"
+
+[[bin]]
+name = "open"
+test = false
+doc = false
+
+[target."cfg(all(unix, not(macos)))".dependencies.pathdiff]
+version = "0.2.0"
+
+[target."cfg(windows)".dependencies.windows-sys]
+version = "0.42"
+features = [
+    "Win32_UI_Shell",
+    "Win32_Foundation",
+    "Win32_UI_WindowsAndMessaging",
+]