update monero-project dependencies for linux (#57)

README.md

@@ -173,7 +173,7 @@ For example, [monero-java](https://github.com/woodser/monero-java) compiles this
 
 1. Clone the project repository if applicable: `git clone --recurse-submodules https://github.com/woodser/monero-cpp.git`
 2. Update submodules: `cd monero-cpp && ./bin/update_submodules.sh`
-3. `sudo apt update && sudo apt install build-essential cmake pkg-config libssl-dev libzmq3-dev libsodium-dev libunwind8-dev liblzma-dev libreadline6-dev libpgm-dev qttools5-dev-tools libhidapi-dev libusb-1.0-0-dev libprotobuf-dev protobuf-compiler libudev-dev libboost-chrono-dev libboost-date-time-dev libboost-filesystem-dev libboost-locale-dev libboost-program-options-dev libboost-regex-dev libboost-serialization-dev libboost-system-dev libboost-thread-dev python3 ccache`
+3. `sudo apt update && sudo apt install build-essential cmake pkg-config libssl-dev libzmq3-dev libunbound-dev libsodium-dev libunwind8-dev liblzma-dev libreadline6-dev libexpat1-dev libpgm-dev qttools5-dev-tools libhidapi-dev libusb-1.0-0-dev libprotobuf-dev protobuf-compiler libudev-dev libboost-chrono-dev libboost-date-time-dev libboost-filesystem-dev libboost-locale-dev libboost-program-options-dev libboost-regex-dev libboost-serialization-dev libboost-system-dev libboost-thread-dev python3 ccache doxygen graphviz nettle-dev libevent-dev`
 4. Follow instructions to install [unbound](https://unbound.docs.nlnetlabs.nl/en/latest/getting-started/installation.html) for Linux to your home directory (e.g. `~/unbound-1.19.0`).
 
     For example, install expat: