Need the libzmq3-dev dependency for building HL Grid in Debian(Ubuntu)

gistfile1.txt

Here is the output I receive if the dependency is not installed:

```
   Compiling zmq-sys v0.11.0
error: failed to run custom build command for `zmq-sys v0.11.0`

Caused by:
  process didn't exit successfully: `/home/arcturus/SRC/grid/target/debug/build/zmq-sys-3e4901fa2053ccc3/build-script-main` (exit status: 101)
  --- stdout
  cargo:rerun-if-env-changed=LIBZMQ_NO_PKG_CONFIG
  cargo:rerun-if-env-changed=PKG_CONFIG
  cargo:rerun-if-env-changed=LIBZMQ_STATIC
  cargo:rerun-if-env-changed=LIBZMQ_DYNAMIC
  cargo:rerun-if-env-changed=PKG_CONFIG_ALL_STATIC
  cargo:rerun-if-env-changed=PKG_CONFIG_ALL_DYNAMIC
  cargo:rerun-if-env-changed=PKG_CONFIG_PATH_x86_64-unknown-linux-gnu
  cargo:rerun-if-env-changed=PKG_CONFIG_PATH_x86_64_unknown_linux_gnu
  cargo:rerun-if-env-changed=HOST_PKG_CONFIG_PATH
  cargo:rerun-if-env-changed=PKG_CONFIG_PATH
  cargo:rerun-if-env-changed=PKG_CONFIG_LIBDIR_x86_64-unknown-linux-gnu
  cargo:rerun-if-env-changed=PKG_CONFIG_LIBDIR_x86_64_unknown_linux_gnu
  cargo:rerun-if-env-changed=HOST_PKG_CONFIG_LIBDIR
  cargo:rerun-if-env-changed=PKG_CONFIG_LIBDIR
  cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR_x86_64-unknown-linux-gnu
  cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR_x86_64_unknown_linux_gnu
  cargo:rerun-if-env-changed=HOST_PKG_CONFIG_SYSROOT_DIR
  cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR

  --- stderr
  thread 'main' panicked at 'Unable to locate libzmq:
  `"pkg-config" "--libs" "--cflags" "libzmq" "libzmq >= 4.1"` did not exit successfully: exit status: 1
  --- stderr
  Package libzmq was not found in the pkg-config search path.
  Perhaps you should add the directory containing `libzmq.pc'
  to the PKG_CONFIG_PATH environment variable
  No package 'libzmq' found
  Package libzmq was not found in the pkg-config search path.
  Perhaps you should add the directory containing `libzmq.pc'
  to the PKG_CONFIG_PATH environment variable
  No package 'libzmq' found
  ', /home/arcturus/.cargo/registry/src/github.com-1ecc6299db9ec823/zmq-sys-0.11.0/build/pkg_config.rs:26:17
  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
warning: build failed, waiting for other jobs to finish...
error: build failed

```