Explain how to install up-to-date meson

On Ubuntu 16.04, meson is 0.29, while scrcpy requires >= 0.37. Explain how to install a newer version from pip3.
2018-11-11 00:08:41 +01:00 · 2018-11-11 00:08:41 +01:00 · b1d2c2c640
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@ -51,6 +51,15 @@ sudo apt install make gcc pkg-config meson \
 sudo apt install openjdk-8-jdk
 ```

+On old versions (like Ubuntu 16.04), `meson` is too old. In that case, install
+it from `pip3`:
+
+```bash
+sudo apt install python3-pip
+pip3 install meson
+```
+
+
 #### Fedora

 ```bash