Update version in meson (#120)

Summary:
Also switch to using git tag format (v0.3.0 instead of 0.3.0).
Pull Request resolved: #120

Reviewed By: filbranden

Differential Revision: D19910997

Pulled By: danobi

fbshipit-source-id: 35b28b091ad5ca461662e5d5ab2cfba82b086408

meson.build

@@ -1,5 +1,5 @@
 project('oomd', 'cpp',
-  version : '0.2.0',
+  version : 'v0.3.1',
   meson_version : '>= 0.45',
   license : 'GPL2',
   default_options : ['stdsplit=false', 'cpp_std=c++17'])