Add proper license and contact info to metadata.

data/write-as-gtk.appdata.xml

@@ -1,6 +1,8 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <component type="desktop-application">
   <id>write-as-gtk</id>
+  <project_license>GPL-3.0+</project_license>
+  <metadata_license>GPL-3.0+</metadata_license>
   <name>write.as</name>
   <summary>Spread your ideas</summary>
 
@@ -19,7 +21,7 @@
   <url type="homepage">https://write.as/</url>
   <url type="help">https://write.as/contact</url>
   <url type="bugtracker">https://code.as/writeas/writeas-gtk/issues</url>
-  <update_contact>matt@write.as</update_contact>
+  <update_contact>hello@write.as</update_contact>
 
   <provides>
     <binary>write-as-gtk</binary>

meson.build

@@ -1,4 +1,7 @@
-project('write-as-gtk', ['vala', 'c'], meson_version: '>=0.40.1')
+project('write-as-gtk', ['vala', 'c'],
+    version: '0.1',
+    license: 'GNU',
+    meson_version: '>=0.40.1')
 
 i18n = import('i18n')
 conf = configuration_data()