Update changelog and Cargo.toml to version 0.2.2 (#51)

Note: I had previously published version 0.3.0, but given that there are no breaking changes here, and that the previously published version was somewhat broken, I'm retracting that and only bumping the minor version here instead.

Author: tschneidereit

CHANGELOG.md

@@ -1,4 +1,4 @@
-## 0.3.0 (2021-10-22)
+## 0.2.2 (2021-11-10)
 
 ### Fixes
 
@@ -12,6 +12,7 @@
 * Resolve URLs passed to `Request` and `fetch` relative to the client request URL's origin (https://github.com/fastly/js-compute-runtime/pull/38)
 * Return null instead of throwing on missing key in `Dictionary#get` (https://github.com/fastly/js-compute-runtime/pull/41)
 * Update to SpiderMonkey 94 beta (https://github.com/fastly/js-compute-runtime/pull/45)
+* Expose environment variables via the `fastly.env.get` function (https://github.com/fastly/js-compute-runtime/pull/50)
 
 ## 0.2.1 (2021-08-27)