Update to error-chain 0.11

Suppress `doc comment not used by rustdoc` warnings

Author: alanhdu

Cargo.lock

@@ -35,7 +35,7 @@ rustup-dist = { path = "src/rustup-dist" }
 rustup-utils = { path = "src/rustup-utils" }
 download = { path = "src/download" }
 clap = "2.18.0"
-error-chain = "0.10"
+error-chain = "0.11"
 itertools = "0.6"
 libc = "0.2.0"
 markdown = "0.2"

Cargo.toml

@@ -14,7 +14,7 @@ curl-backend = ["curl"]
 reqwest-backend = ["reqwest", "env_proxy", "lazy_static"]
 
 [dependencies]
-error-chain = "0.10"
+error-chain = "0.11"
 url = "1.2"
 curl = { version = "0.4.6", optional = true }
 env_proxy = { version = "0.1.1", optional = true }

src/download/Cargo.toml

@@ -25,7 +25,7 @@ toml = "0.4"
 sha2 = "0.6.0"
 remove_dir_all = "0.2"
 rustup-utils = { path = "../rustup-utils" }
-error-chain = "0.10"
+error-chain = "0.11"
 
 [dev-dependencies]
 rustup-mock = { path = "../rustup-mock" }

src/rustup-dist/Cargo.toml

@@ -13,7 +13,7 @@ license = "MIT OR Apache-2.0"
 
 [dependencies]
 download = { path = "../download" }
-error-chain = "0.10"
+error-chain = "0.11"
 libc = "0.2.0"
 rand = "0.3.11"
 remove_dir_all = "0.2.0"