increment version number to 0.20.22

NEWS

+ver 0.20.22 (not yet released)
+
 ver 0.20.21 (2018/08/17)
 * database
   - proxy: add "password" setting

android/AndroidManifest.xml

@@ -2,8 +2,8 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
           package="org.musicpd"
           android:installLocation="auto"
-          android:versionCode="20"
-          android:versionName="0.20.21">
+          android:versionCode="21"
+          android:versionName="0.20.22">
 
   <uses-sdk android:minSdkVersion="21" android:targetSdkVersion="21"/>
 

configure.ac

 AC_PREREQ(2.60)
 
-AC_INIT(mpd, 0.20.21, musicpd-dev-team@lists.sourceforge.net)
+AC_INIT(mpd, 0.20.22, musicpd-dev-team@lists.sourceforge.net)
 
 VERSION_MAJOR=0
 VERSION_MINOR=20
-VERSION_REVISION=21
+VERSION_REVISION=22
 VERSION_EXTRA=0
 
 AC_CONFIG_SRCDIR([src/Main.cxx])