Fix newly occured clippy errors

1 job for rustfmt in 1 minute and 32 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Test
failed test #204

00:01:32

 
Name Stage Failure
failed
test Test
    Checking walkdir v0.1.8
Checking mio v0.5.1
Checking notify v3.0.1
Checking handlebars-iron v0.25.2
Checking medal v0.1.0 (/builds/zgtm/medal-prototype)
Finished dev [unoptimized + debuginfo] target(s) in 27.08s
$ cargo +nightly fmt -- --check
error: toolchain 'nightly-x86_64-unknown-linux-gnu' is not installed
ERROR: Job failed: exit code 1