Update dependencies

Cargo.toml

@@ -15,14 +15,14 @@ exclude = [
 ]
 
 [dependencies]
-clap = "1.5.3"
-handlebars = "0.12.0"
-rustc-serialize = "0.3.16"
-pulldown-cmark = "0.0.6"
+clap = "2.2.1"
+handlebars = "0.16.0"
+rustc-serialize = "0.3.18"
+pulldown-cmark = "0.0.7"
 
 # Watch feature
 notify = { version = "2.5.4", optional = true }
-time = { version = "0.1.33", optional = true }
+time = { version = "0.1.34", optional = true }
 crossbeam = { version = "0.2.8", optional = true }
 
 

src/bin/mdbook.rs

@@ -16,7 +16,7 @@ use std::error::Error;
 use std::io::{self, Write};
 use std::path::{Path, PathBuf};
 
-use clap::{App, ArgMatches, SubCommand};
+use clap::{App, ArgMatches, SubCommand, AppSettings};
 
 // Uses for the Watch feature
 #[cfg(feature = "watch")]
@@ -36,7 +36,7 @@ fn main() {
                     .author("Mathieu David <[email protected]>")
                     // Get the version from our Cargo.toml using clap's crate_version!() macro
                     .version(&*format!("v{}", crate_version!()))
-                    .subcommand_required(true)
+                    .setting(AppSettings::SubcommandRequired)
                     .after_help("For more information about a specific command, try `mdbook <command> --help`")
                     .subcommand(SubCommand::with_name("init")
                         .about("Create boilerplate structure and files in the directory")