Increment version in meson build file

Increment raylib version and so lib version number.

meson.build

@@ -1,4 +1,4 @@
-project('raylib', 'c', version:	'1.7.0',
+project('raylib', 'c', version:	'1.8.0',
 		license: 'zlib',
 		meson_version: '>= 0.39.1',
 		default_options : 'c_std=gnu99')

src/meson.build

@@ -18,5 +18,5 @@ raylib = library('raylib',
                   source_c,
                   dependencies : [ glfw_dep, gl_dep, openal_dep, m_dep, x11_dep],
                   install : true,
-                  version : '1.7.0')
+                  version : '1.8.0')