Revise coverage section in BUILD.md to use cargo-llvm-cov

.gitignore

@@ -18,3 +18,7 @@ Cargo.lock
 
 # Misc config files
 .config
+
+# Profiling files
+*.profraw
+lcov.info

BUILD.md

@@ -29,10 +29,20 @@ cargo bench -- --save-baseline baseline
 cargo bench -- --baseline baseline
 ```
 
-## Coverage report
+## Coverage report (using [cargo-llvm-cov](https://crates.io/crates/cargo-llvm-cov))
+
+Install `cargo-llvm-cov`
+```bash
+cargo +stable install cargo-llvm-cov --locked
+```
+
+Generate a HTML report
+```bash
+cargo +nightly llvm-cov --doctests --html
+open target/llvm-cov/html/index.html
+```
+
+Generate a coverage file for [Coverage Gutters](https://marketplace.visualstudio.com/items?itemName=ryanluker.vscode-coverage-gutters) in VSCode
 ```bash
-# on ubuntu..
-# apt install llvm-14 jq
-# cargo install rustfilt
-./coverage.sh
+cargo +nightly llvm-cov --doctests --lcov --output-path lcov.info
 ```

CHANGELOG.md

@@ -11,6 +11,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
  - Add `From<ChunkKeyEncodingTraits>` for `ChunkKeyEncoding`
  - Add chunk key encoding tests
 
+### Changed
+ - Revise coverage section in `BUILD.md` to use `cargo-llvm-cov`
+
 ### Fixed
  - Fixed chunk key encoding for 0 dimensional arrays with `default` and `v2` encoding