transfer changelog to the doc

NOTES

@@ -820,8 +820,3 @@ XXX - test it upgraded and installed on oldish device (set up android emulator)
 XXX - test it installed on x86 with android emulator
 
 XXX - libiconv? HAVE_ICONV_H etc
-XXX - changelog:
-  - API 28
-  - x86_64, arm64
-  - should now find native libraries even under a user account
-  - fix more possible color issues

doc/index.html

@@ -179,6 +179,9 @@ regular <tt>rsa</tt> key for greatest compatibility.
 <h2>Change Log</h2>
 
 <ul>
+<li> <b>2019/05/XXX Version 20:</b> Update SDK.  Support x86_64, arm64.
+Fix finding support libraries.  Fix colors (again).  Fix start-on-boot on
+Pie (9.0).
 <li> <b>2018/05/19 Version 19:</b> Use the app-private directory by
 default on new installs for the SSH/home dir.  Organize settings.  Fix
 black-on-black text on some devices.