Bump Tokio to v0.1.15. (#869)

Also bumps:

- tokio-sync (0.1.0)
- tokio-threadpool (0.1.11)
- tokio-timer (0.2.9)

tokio-sync/CHANGELOG.md

@@ -0,0 +1,3 @@
+# 0.1.0 (January 24, 2019)
+
+- Initial Release

tokio-sync/Cargo.toml

@@ -1,9 +1,10 @@
 [package]
 name = "tokio-sync"
-
 # When releasing to crates.io:
 # - Update html_root_url.
 # - Update doc url
+#   - Cargo.toml
+#   - README.md
 # - Update CHANGELOG.md.
 # - Create "v0.1.x" git tag.
 version = "0.1.0"

tokio-sync/README.md

@@ -0,0 +1,19 @@
+# tokio-sync
+
+Synchronization utilities
+
+[Documentation](https://docs.rs/tokio-sync/0.1.0/tokio_sync/)
+
+## Overview
+
+This crate provides synchronization utilities for usage with Tokio.
+
+## License
+
+This project is licensed under the [MIT license](LICENSE).
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in Tokio by you, shall be licensed as MIT, without any additional
+terms or conditions.