Do not list dependency packages by MetadataCommand

When following `cargo-fuzz` tutorial at
https://rust-fuzz.github.io/book/cargo-fuzz/tutorial.html,
after executing `cargo fuzz init`, `fuzz/Cargo.toml`
contains entry `[dependencies.matches]` instead of
`[dependencies.url]`. This is caused by `MetadataCommand`
listing dependency packages in addition to main packages
which is not desired.

This does work as expected if result of `MetadataCommand`
contains the first package as the non-dep package but that does
not seem to work all the time.

src/project.rs

@@ -938,11 +938,11 @@ pub struct Manifest {
 
 impl Manifest {
     pub fn parse() -> Result<Self> {
-        let metatdata = MetadataCommand::new().exec()?;
-        let package = metatdata.packages.first().with_context(|| {
+        let metadata = MetadataCommand::new().no_deps().exec()?;
+        let package = metadata.packages.first().with_context(|| {
             anyhow!(
                 "Expected to find at least one package in {}",
-                metatdata.target_directory
+                metadata.target_directory
             )
         })?;
         let crate_name = package.name.clone();