Restrict protobuf updates

Cargo.toml

@@ -40,7 +40,7 @@ getopts = "0.2"
 hyper = "0.11"
 log = "0.4"
 num-bigint = "0.2"
-protobuf = "2.7"
+protobuf = "2.8.*"
 rand = "0.7"
 rpassword = "3.0"
 tokio-core = "0.1"

connect/Cargo.toml

@@ -16,7 +16,7 @@ futures = "0.1"
 hyper = "0.11"
 log = "0.4"
 num-bigint = "0.2"
-protobuf = "2.7"
+protobuf = "2.8.*"
 rand = "0.7"
 serde = "1.0"
 serde_derive = "1.0"

core/Cargo.toml

@@ -22,7 +22,7 @@ log = "0.4"
 num-bigint = "0.2"
 num-integer = "0.1"
 num-traits = "0.2"
-protobuf = "2.7"
+protobuf = "2.8.*"
 rand = "0.7"
 serde = "1.0"
 serde_derive = "1.0"

metadata/Cargo.toml

@@ -7,7 +7,7 @@ authors = ["Paul Lietar <paul@lietar.net>"]
 byteorder = "1.3"
 futures = "0.1"
 linear-map = "1.2"
-protobuf = "2.7"
+protobuf = "2.8.*"
 
 [dependencies.librespot-core]
 path = "../core"

protocol/Cargo.toml

@@ -5,7 +5,7 @@ authors = ["Paul Liétar <paul@lietar.net>"]
 build = "build.rs"
 
 [dependencies]
-protobuf = "2.7"
+protobuf = "2.8.*"
 
 [build-dependencies]
-protobuf-codegen-pure = "2.7"
+protobuf-codegen-pure = "2.8.*"