Install readline dependency

Needed for the REPL example.

Author: ptomato

.github/workflows/build.yml

@@ -28,7 +28,7 @@ jobs:
     - uses: actions/checkout@v2
     - name: Install deps
       run: |
-        sudo apt install ccache llvm clang lld meson ninja-build -y
+        sudo apt install ccache libreadline-dev llvm clang lld meson ninja-build -y
     - uses: actions-rs/toolchain@v1
       with:
           profile: minimal