Correct grammar

Author: kellytk

text/007-2019-roadmap.md

@@ -176,7 +176,7 @@ will eventually have rich, source-level debugging for Wasm.
 <cite>&mdash; Nick Fitzgerald in [Rust and WebAssembly in
 2019](http://fitzgeraldnick.com/2018/12/14/rust-and-webassembly-in-2019.html)</cite>
 
-In 2019, our toolchain and workflow should feature complete and
+In 2019, our toolchain and workflow should be feature complete and
 polished. `wasm-pack`, being the entry point to our toolchain, will bear the
 brunt of this work, but much of it will also be in tools that are invoked by
 `wasm-pack` rather than work in `wasm-pack` itself.