Changelog 3.1.1

OpenKeychain/src/main/res/raw/help_changelog.html

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+<h2>3.1.1</h2>
+<ul>
+<li>Fix key export to files (they were written partially)</li>
+<li>Fix crash on Android 2.3</li>
+</ul>
+
 <h2>3.1</h2>
 <ul>
 <li>Fix crash on Android 5</li>