README: improve description and fix interop command (#74)

* README: improve description and fix interop command

* rephrase

Author: marten-seemann

README.md

@@ -4,9 +4,9 @@
 [![Code Coverage](https://img.shields.io/codecov/c/github/quic-go/qpack/master.svg?style=flat-square)](https://codecov.io/gh/quic-go/qpack)
 [![Fuzzing Status](https://oss-fuzz-build-logs.storage.googleapis.com/badges/quic-go.svg)](https://bugs.chromium.org/p/oss-fuzz/issues/list?sort=-opened&can=1&q=proj:quic-go)
 
-This is a minimal QPACK ([RFC 9204](https://datatracker.ietf.org/doc/html/rfc9204)) implementation in Go. It is minimal in the sense that it doesn't use the dynamic table at all, but just the static table and (Huffman encoded) string literals. Wherever possible, it reuses code from the [HPACK implementation in the Go standard library](https://github.com/golang/net/tree/master/http2/hpack).
+This is a minimal QPACK ([RFC 9204](https://datatracker.ietf.org/doc/html/rfc9204)) implementation in Go. It reuses the Huffman encoder / decoder code from the [HPACK implementation in the Go standard library](https://github.com/golang/net/tree/master/http2/hpack).
 
-It is interoperable with other QPACK implementations (both encoders and decoders), however it won't achieve a high compression efficiency. If you're interested in dynamic table support, please comment on [the issue](https://github.com/quic-go/qpack/issues/33).
+It is fully interoperable with other QPACK implementations (both encoders and decoders). However, it does not support the dynamic table and relies solely on the static table and string literals (including Huffman encoding), which limits compression efficiency. If you're interested in dynamic table support, please comment on [issue #33](https://github.com/quic-go/qpack/issues/33).
 
 ## Running the Interop Tests
 
@@ -17,5 +17,5 @@ git submodule update --init --recursive
 
 Then run the tests:
 ```bash
-go test -v ./integrationtests/interop/
+go test -v ./interop
 ```