bump `uuid` dependency from 0.7 to 0.8

seems compatible

Cargo.lock

@@ -1339,7 +1339,7 @@ dependencies = [
  "tokio-core 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
  "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "uuid 0.7.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "uuid 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "vergen 3.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -2979,10 +2979,10 @@ dependencies = [
 
 [[package]]
 name = "uuid"
-version = "0.7.4"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -3531,7 +3531,7 @@ dependencies = [
 "checksum ureq 0.11.4 (registry+https://github.com/rust-lang/crates.io-index)" = "801125e6d1ba6864cf3a5a92cfb2f0b0a3ee73e40602a0cd206ad2f3c040aa96"
 "checksum url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)" = "dd4e7c0d531266369519a4aa4f399d748bd37043b00bde1e4ff1f60a120b355a"
 "checksum url 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5909f2b0817350449ed73e8bcd81c8c3c8d9a7a5d8acba4b27db277f1868976e"
-"checksum uuid 0.7.4 (registry+https://github.com/rust-lang/crates.io-index)" = "90dbc611eb48397705a6b0f6e917da23ae517e4d127123d2cf7674206627d32a"
+"checksum uuid 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "9fde2f6a4bea1d6e007c4ad38c6839fa71cbb63b6dbf5b595aa38dc9b1093c11"
 "checksum vergen 3.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "4ce50d8996df1f85af15f2cd8d33daae6e479575123ef4314a51a70a230739cb"
 "checksum version_check 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)" = "b5a972e5669d67ba988ce3dc826706fb0a8b01471c088cb0b6110b805cc36aed"
 "checksum void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"

core/Cargo.toml

@@ -36,7 +36,7 @@ tokio-codec = "0.1"
 tokio-core = "0.1"
 tokio-io = "0.1"
 url = "1.7"
-uuid = { version = "0.7", features = ["v4"] }
+uuid = { version = "0.8", features = ["v4"] }
 sha-1 = "0.8"
 hmac = "0.7"
 pbkdf2 = "0.3"