Vendor dependencies for 0.3.0 release

vendor/sysinfo/md_doc/is_supported.md

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+Returns `true` if this OS is supported. Please refer to the
+[crate-level documentation](index.html) to get the list of supported OSes.
+
+```
+if sysinfo::IS_SUPPORTED_SYSTEM {
+    println!("This OS is supported!");
+} else {
+    println!("This OS isn't supported (yet?).");
+}
+```

vendor/sysinfo/md_doc/minimum_cpu_update_interval.md

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+This is the minimum interval time used internally by `sysinfo` to refresh the CPU time.
+
+⚠️ This value differs from one OS to another.
+
+Why is this constant even needed?
+
+If refreshed too often, the CPU usage of processes will be `0` whereas on Linux it'll
+always be the maximum value (`number of CPUs * 100`).

vendor/sysinfo/md_doc/pid.md

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+Process ID.
+
+Can be used as an integer type by simple casting. For example:
+
+```
+use sysinfo::Pid;
+
+// 0's type will be different depending on the platform!
+let p = Pid::from(0);
+
+// For something more "general":
+let p = Pid::from_u32(0);
+let i: u32 = p.as_u32();
+```
+
+On glibc systems this is a glibc [`pid_t`](https://www.gnu.org/software/libc/manual/html_node/Process-Identification.html).
+
+On Windows systems this is a [`usize` and represents a windows process identifier](https://docs.microsoft.com/en-us/windows/win32/procthread/process-handles-and-identifiers).
+
+On unsupported systems, this is also a `usize`.

vendor/sysinfo/md_doc/serde.md

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+
+With the `serde` feature enabled, you can then serialize `sysinfo` types. Let's see an example with `serde_json`:
+
+```
+use sysinfo::System;
+
+let mut sys = System::new_all();
+// First we update all information of our `System` struct.
+sys.refresh_all();
+
+println!("{}", serde_json::to_string(&sys).unwrap());
+```

vendor/sysinfo/md_doc/sid.md

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+Opaque type encapsulating a Windows SID.

vendor/sysinfo/md_doc/supported_signals.md

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+Returns the list of the supported signals on this system (used by
+[`Process::kill_with`][crate::Process::kill_with]).
+
+```
+use sysinfo::{System, SUPPORTED_SIGNALS};
+
+println!("supported signals: {:?}", SUPPORTED_SIGNALS);
+```