Auto merge of #2549 - JohnTitor:more-deps, r=jtgeibel
Auto merge of #2549 - JohnTitor:more-deps, r=jtgeibel

Update more*2 backend dependencies

3e674dd1374a1f1d3038535a819615fef3702ff2 is the only _unsafe_ thing, this introduces new dependencies.
https://github.com/sunng87/handlebars-rust/compare/v3.0.1...v3.1.0

Also, this updates some dependencies that were recently updated via f88d028c40d09aea9152de0b61204e2cd4131f72.

r? @jtgeibel

rust-lang/crates.io,rust-lang/crates.io,rust-lang/crates.io,rust-lang/crates.io