docs: update changelog

CHANGELOG.md

@@ -17,6 +17,26 @@ Types of changes
 - Security in case of vulnerabilities.
 -->
 
+## [1.2.0] - 2022-04-05
+
+### Added
+
+- A new i686-linux system to the flake.
+- `apps.${system}.default` to the Flake
+  so that newer versions of Nix
+  understand this instead of `defaultApp.${system}`.
+
+### Fixed
+
+- A typo in the documentation where `aarch64-linux` appeared twice
+  and `aarch64-darwin` didn't.
+
+### Security
+
+- New CVEs were discovered in the third party dependencies of our website:
+  https://kamadorueda.github.io/alejandra/
+  and so we updated those front-end dependencies to their latest version.
+
 ## [1.1.0] - 2022-03-10
 
 ### Added

src/alejandra_cli/src/cli.rs

@@ -23,7 +23,10 @@ pub(crate) fn parse(args: Vec<String>) -> clap::ArgMatches {
         )
         .arg(
             clap::Arg::new("check")
-                .help("Check if the input is already formatted.")
+                .help(
+                    "Check if the input is already formatted and disable \
+                     writing in-place the modified content.",
+                )
                 .long("--check")
                 .short('c'),
         )