rust-chg: depend on log and tokio_timer

I'll start porting the daemon management functions from chg of C, which
will be difficult to debug without some logging facility. AFAIK, the log
crate is easy-to-use and widely used.

tokio_timer provides sleep() helper to be used while spawning a server
process.

rust/chg/Cargo.lock

@@ -1,687 +1,689
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rust/chg/Cargo.toml

@@ -1,18 +1,20
 [package]
 name = "chg"
 version = "0.1.0"
 authors = ["Yuya Nishihara <[e-mail]>"]
 description = "Client for Mercurial command server with cHg extension"
 license = "GPL-2.0+"
 
 [dependencies]
 bytes = "0.4"
 futures = "0.1"
 libc = "0.2"
+log = { version = "0.4", features = ["std"] }
 tokio = "0.1"
 tokio-hglib = "0.2"
 # TODO: "^0.2.3" once released. we need AsRawFd support.
 tokio-process = { git = "https://github.com/alexcrichton/tokio-process" }
+tokio-timer = "0.2"
 
 [build-dependencies]
 cc = "1.0"