Flatpak elementary (#29)

* Replaced h2 tag with p tag since it's not valid to use anymore.

* Added Flatpak manifest for Elementary.

com.github.plugarut.pwned-checker.yml

@@ -0,0 +1,26 @@
+---
+app-id: com.github.plugarut.pwned-checker
+runtime: io.elementary.Platform
+sdk: io.elementary.Sdk
+runtime-version: '6'
+command: com.github.plugarut.pwned-checker
+finish-args:
+- "--share=ipc"
+- "--share=network"
+- "--socket=x11"
+- "--socket=wayland"
+cleanup:
+- "/include"
+- "/lib/pkgconfig"
+- "/lib/*.la"
+- "/share/gir-1.0"
+- "/lib/girepository-1.0"
+- "/share/vala"
+- "/share/gtk-doc"
+modules:
+- name: pwned-checker
+  buildsystem: meson
+  sources:
+  - type: dir
+    path: .
+

data/com.github.plugarut.pwned-checker.appdata.xml.in

@@ -41,7 +41,7 @@
     </release>
     <release version="0.2.1" date="2018-10-18">
       <description>
-        <h2>Juno Release</h2>
+        <p>Juno Release</p>
         <ul>
             <li>Juno Release</li>
             <li>Bug fixes</li>