changelog: fix some typos

PR #987

Author: tshepang

CHANGELOG.md

@@ -17,11 +17,11 @@ optimizations and lead to a false positive match.
 This is a sizeable release that will be soon followed by another sizeable
 release. Both of them will combined close over 40 existing issues and PRs.
 
-This first release, despite its size, essentially represent preparatory work
+This first release, despite its size, essentially represents preparatory work
 for the second release, which will be even bigger. Namely, this release:
 
 * Increases the MSRV to Rust 1.60.0, which was released about 1 year ago.
-* Upgrades its dependency on `aho-corasick` to the recently release 1.0
+* Upgrades its dependency on `aho-corasick` to the recently released 1.0
 version.
 * Upgrades its dependency on `regex-syntax` to the simultaneously released
 `0.7` version. The changes to `regex-syntax` principally revolve around a