Update various dependencies

	% cargo update
	    Removing MacTypes-sys v2.1.0
	    Updating bitflags v1.0.4 -> v1.0.5
	    Updating block-padding v0.1.3 -> v0.1.4
	    Updating cc v1.0.35 -> v1.0.36
	    Updating cookie v0.11.0 -> v0.11.1
	    Updating core-foundation v0.5.1 -> v0.6.4
	    Updating core-foundation-sys v0.5.1 -> v0.6.2
	    Updating curl v0.4.20 -> v0.4.21
	    Updating curl-sys v0.4.17 -> v0.4.18
	    Updating dtoa v0.4.3 -> v0.4.4
	    Updating filetime v0.2.4 -> v0.2.5
	    Updating git-testament v0.1.4 -> v0.1.5
	    Updating git-testament-derive v0.1.5 -> v0.1.6
	    Updating hyper v0.12.27 -> v0.12.28
	    Updating itoa v0.4.3 -> v0.4.4
	    Updating libc v0.2.51 -> v0.2.54
	    Updating native-tls v0.2.2 -> v0.2.3
	      Adding numtoa v0.1.0
	    Updating openssl v0.10.20 -> v0.10.21
	    Updating openssl-sys v0.9.43 -> v0.9.45
	    Updating proc-macro2 v0.4.27 -> v0.4.29
	    Updating rand_jitter v0.1.3 -> v0.1.4
	    Updating reqwest v0.9.15 -> v0.9.16
	    Updating ryu v0.2.7 -> v0.2.8
	    Updating security-framework v0.2.2 -> v0.3.1
	    Updating security-framework-sys v0.2.3 -> v0.3.1
	    Updating syn v0.15.31 -> v0.15.33
	    Updating tar v0.4.22 -> v0.4.24
	    Updating termion v1.5.1 -> v1.5.2
	    Updating tokio v0.1.18 -> v0.1.19
	    Updating tokio-sync v0.1.4 -> v0.1.5
	    Updating tokio-threadpool v0.1.13 -> v0.1.14
	    Updating unicase v2.3.0 -> v2.4.0

Author: tesuji