update required meson version

Author: Tony Crisci

README.md

@@ -239,7 +239,7 @@ meson mesonbuild
 sudo ninja -C mesonbuild install
 ```
 
-Note that you need `meson >= 0.46.0` installed. In case your distro only has an older version of meson in its repository you can install the newest version via pip:
+Note that you need `meson >= 0.50.0` installed. In case your distro only has an older version of meson in its repository you can install the newest version via pip:
 
 ```
 pip3 install meson

meson.build

@@ -2,7 +2,7 @@ project(
   'playerctl',
   'c',
   version: '2.0.2',
-  meson_version: '>=0.46.0'
+  meson_version: '>=0.50.0'
 )
 
 release_date = 'March 26, 2019'