build(deps): bump socket2 from 0.3.12 to 0.3.19 in /examples (#89)

Bumps [socket2](https://github.com/rust-lang/socket2) from 0.3.12 to 0.3.19.
- [Release notes](https://github.com/rust-lang/socket2/releases)
- [Changelog](https://github.com/rust-lang/socket2/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rust-lang/socket2/compare/0.3.12...v0.3.19)

---
updated-dependencies:
- dependency-name: socket2
  dependency-type: indirect
...

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examples/Cargo.lock

@@ -1266,13 +1266,12 @@ checksum = "f2dd574626839106c320a323308629dcb1acfc96e32a8cba364ddc61ac23ee83"
 
 [[package]]
 name = "socket2"
-version = "0.3.12"
+version = "0.3.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "03088793f677dce356f3ccc2edb1b314ad191ab702a5de3faf49304f7e104918"
+checksum = "122e570113d28d773067fab24266b66753f6ea915758651696b6e35e49f88d6e"
 dependencies = [
- "cfg-if 0.1.10",
+ "cfg-if 1.0.0",
  "libc",
- "redox_syscall 0.1.57",
  "winapi 0.3.9",
 ]