CBC-924 Cleanup Code and Documentation

- update CHANGELOG.md

.github/dependabot.yml

@@ -1,8 +1,3 @@
-# To get started with Dependabot version updates, you'll need to specify which
-# package ecosystems to update and where the package manifests are located.
-# Please see the documentation for all configuration options:
-# https://docs.github.com/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
-
 version: 2
 updates:
   - package-ecosystem: "cargo" 

CHANGELOG.md

@@ -1,3 +1,45 @@
+## OpenEthereum v3.4.0
+
+This release is based on the last stable version, v3.3.5, and serves as a maintenance
+update with various improvements, security patches, and enhancements. Key highlights
+include the introduction of JSON logging support, migration to _Rust Version 1.79_
+and several security fixes.
+
+Enhancements
+
+* Introduced JSON logging
+* Added debug configurations for VSCode Debugging
+* Prepared code coverage tool _cargo-tarpaulin_
+* Added quality-of-life scripts for building, testing, and running the client 
+* Add testing support for Leopold PoA blockchain
+
+DevOps
+
+* Upgraded Rust to Version 1.79 by fixing runtime `mio` errors and resolving IPv6 discovery issues in test cases
+* Migrated the Docker base image to a scratch image with static linking, optimizing for minimal size and security
+* Activate Dependabot for automatic dependency updates
+
+Cleanup
+
+* Migrated to using the `substrate-bn` crate from crates.io instead of the GitHub repository
+* Added a development profile without optimizations for faster compilation times
+* Resolved several compiler warnings in new Rust Version
+* Updated `num-bigint` and related types for future compatibility
+
+Security fixes
+
+* Removed the deprecated `failure` crate, replacing it with daemonize to mitigate critical vulnerabilities
+* Updated `crossbeam-deque` and `crossbeam-utils` to version 0.8.20 to fix data race vulnerabilities
+* Bumped the `time` crate to address a segmentation fault issue
+* Updated `regex` and related dependencies to resolve a denial-of-service vulnerability
+* Applied further minor version upgrades to dependencies to ensure better security
+* Update Dockerfiles for more security
+
+Bug fixes
+
+* Resolved issues with test case in version 1.79.0
+* Fix build for alpine images
+
 ## OpenEthereum v3.3.5
 
 Enhancements:

MAINTENANCE.md

@@ -0,0 +1,33 @@
+# Setup Development Environment [Ubuntu 20.04.6 LTS]
+
+This fork of OpenEthereum project is developed and tested under Ubuntu. 
+The current state will not work under macOS and Windows is not tested.
+
+## Install Tools
+
+```shell
+curl https://sh.rustup.rs -sSf | sh
+export PATH=$PATH:$HOME/.cargo/bin
+```
+
+```shell
+sudo apt update
+```
+
+```shell
+sudo apt upgrade
+```
+
+```shell
+sudo apt install yasm
+```
+
+```shell
+sudo apt install tree
+````
+
+## Select Rust Version
+
+```shell
+./scripts/setup-rust-1.79.sh
+```