set version to v2.2.0

Author: KtorZ

.github/workflows/continuous-integration.yml

@@ -33,7 +33,7 @@ jobs:
       - name: 🧰 Install Aiken
         uses: aiken-lang/setup-aiken@v1
         with:
-          version: v1.1.4
+          version: v1.1.9
 
       - name: 📝 Run fmt
         run: aiken fmt --check

aiken.toml

@@ -1,5 +1,5 @@
 name = "aiken-lang/stdlib"
-version = "main"
+version = "2.2.0"
 compiler = "v1.1.9"
 plutus = "v3"
 description = "The Aiken Standard Library"