Update changelog to 0.4.2

Create changelog entries for 0.4.0, 0.4.1, and 0.4.2.

CHANGELOG.md

@@ -1,3 +1,51 @@
+# 0.4.2
+
+Features:
+* Extend kmstool-instance and kmstool-enclave to support Encryption Context from CLI arguments (fixes issues #35, #143)
+* Add new API functions for Encrypt/Decrypt operations with context and prepared requests:
+  - `aws_kms_decrypt_blocking_with_context`
+  - `aws_kms_encrypt_blocking_with_context`
+  - `aws_kms_encrypt_blocking_from_request`
+  - `aws_kms_decrypt_blocking_from_request`
+* Add `genrandom` command to kmstool-enclave-cli (fixes issue #131)
+
+Fixes:
+* Fix kmstool-enclave-cli test script location reference
+* Apply stricter compilation options (-Wall, -Werror, -Wpedantic) to SDK library
+
+Updates:
+* Add test scripts for kmstool-enclave-cli
+* Add test summary in smoke test script
+* Add GitHub Actions workflow for building and running tests
+
+Docs:
+* Update kmstool documentation for Docker 24.x `vsock` socket restrictions
+* Update README for kmstool-enclave-cli
+  - Fix incorrect content on `genkey` command
+  - Improve formatting
+* Update success messages in test script README
+
+# 0.4.1
+
+Fixes:
+* Containers: Fallback to older releases for some dependencies
+  - Specifically, revert to aws-c-io v0.11.0 due to runtime issues in newer versions
+  - This addresses a limitation described in https://github.com/awslabs/aws-c-io/issues/576
+
+# 0.4.0
+
+Updates:
+* Update aws-nitro-enclaves-nsm-api from v0.3.0 to v0.4.0
+* Update Rust version to 1.63 in containers (fixes issue #115)
+* Use shallow clones for dependencies to reduce build time
+* Update multiple dependencies and README.md file
+
+Fixes:
+* Fix build failures related to `CBS_get_any_ber_asn1_element` function
+
+Changes:
+* Replace DockerHub images with AWS ECR images to avoid rate limiting
+
 # 0.3.2
 
 Fixes: