README: add dependency on libpgm-dev

README.md

@@ -137,6 +137,7 @@ library archives (`.a`).
 | Boost        | 1.58          | NO       | `libboost-all-dev` | `boost`      | `boost-devel`     | NO       | C++ libraries  |
 | OpenSSL      | basically any | NO       | `libssl-dev`       | `openssl`    | `openssl-devel`   | NO       | sha256 sum     |
 | libzmq       | 3.0.0         | NO       | `libzmq3-dev`      | `zeromq`     | `cppzmq-devel`    | NO       | ZeroMQ library |
+| OpenPGM      | ?             | NO       | `libpgm-dev`       | `libpgm`     | `openpgm-devel`   | NO       | For ZeroMQ     |
 | libunbound   | 1.4.16        | YES      | `libunbound-dev`   | `unbound`    | `unbound-devel`   | NO       | DNS resolver   |
 | libsodium    | ?             | NO       | `libsodium-dev`    | ?            | `libsodium-devel` | NO       | libsodium      |
 | libunwind    | any           | NO       | `libunwind8-dev`   | `libunwind`  | `libunwind-devel` | YES      | Stack traces   |
@@ -154,7 +155,7 @@ library archives (`.a`).
 build the library binary manually. This can be done with the following command ```sudo apt-get install libgtest-dev && cd /usr/src/gtest && sudo cmake . && sudo make && sudo mv libg* /usr/lib/ ```
 
 Debian / Ubuntu one liner for all dependencies  
-``` sudo apt update && sudo apt install build-essential cmake pkg-config libboost-all-dev libssl-dev libzmq3-dev libunbound-dev libsodium-dev libunwind8-dev liblzma-dev libreadline6-dev libldns-dev libexpat1-dev doxygen graphviz libpcsclite-dev ```
+``` sudo apt update && sudo apt install build-essential cmake pkg-config libboost-all-dev libssl-dev libzmq3-dev libunbound-dev libsodium-dev libunwind8-dev liblzma-dev libreadline6-dev libldns-dev libexpat1-dev doxygen graphviz libpcsclite-dev libpgm-dev```
 
 ### Cloning the repository