add changelog [skipci]

Author: tanmaykm

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## 3.0.0
+
+- **BREAKING**: `evalscript` method signature is now changed to take `keys` and `args` as separate arguments. (Ref: https://github.com/JuliaDatabases/Redis.jl/pull/109)
+- **BREAKING**: `evalscript` method now does not convert return values to `String` or `Vector{String}`. Instead the exact returned type from script is returned. (Ref: https://github.com/JuliaDatabases/Redis.jl/pull/110)
+- `evalscript` is now allowed with `PipelineConnection` and `TransactionConnection`.
+
+## 2.1.0
+
+- TLS support added. `RedisConnection` now accepts an optional `sslconfig` parameter that can contain an instance of `MbedTLS.SSLConfig` to use for TLS. (Ref: https://github.com/JuliaDatabases/Redis.jl/pull/103)
+- New `psubscribe_data` method added, similar to the existing `subscribe_data` method, but for pattern subscriptions. (Ref: https://github.com/JuliaDatabases/Redis.jl/pull/102)
+
+Fixes:
+- Fixes to avoid worldage issue in subscription callback (Ref: https://github.com/JuliaDatabases/Redis.jl/pull/100)
+- Improvements to command execution speed (Ref: https://github.com/JuliaDatabases/Redis.jl/pull/97)
+- Other miscellaneous fixes and improvements to CI