Apply suggestions from code review

Co-Authored-By: Mark Rousskov <[email protected]>

Author: nikomatsakis

posts/2019-10-28-nll-hard-errors.md

@@ -4,7 +4,7 @@ title: "Completing the transition to the new borrow checker"
 author: Niko Matsakis
 ---
 
-For most of 2018, we've been issue warnings about various bugs in the
+For most of 2018, we've been issuing warnings about various bugs in the
 borrow checker that we plan to fix -- about two months ago, in the
 current Rust nightly, those warnings became **hard errors**. In about
 two weeks, when the nightly branches to become beta, those hard errors
@@ -86,6 +86,7 @@ The most common crates that were affected are the following:
 
 * `url` version 1.7.0 -- you can upgrade to 1.7.2, though you'd be better off upgrading to 2.1.0
 * `nalgebra` version 0.16.13 -- you can upgrade to 0.16.14, though you'd be better off upgrading to 0.19.0
+* `rusttype` version 0.2.0 to 0.2.3 -- you can upgrade to 0.2.4, though you'd be better off looking at upgrading to 0.8.1
 
 You can find out which crates you rely upon using the [cargo-tree] command. If you find
 that you *do* rely (say) on `url` 1.7.0, you can upgrade to 1.7.2 by executing: