Update ChangeLog in prep for 7.20 release.

TODO

@@ -1,4 +1,4 @@
-NuttX TODO List (Last updated March 4, 2017)
+NuttX TODO List (Last updated March 7, 2017)
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 This file summarizes known NuttX bugs, limitations, inconsistencies with
@@ -1196,7 +1196,7 @@ o USB (drivers/usbdev, drivers/usbhost)
                from being usable:
 
               - The driver works fine when configured for reduced or bulk-
-                only protocol.
+                only protocol on the Olimex LPC1766STK.
 
               - Testing has not been performed with the interrupt IN channel
                 enabled (ie., I have not enabled FLOW control nor do I have
@@ -1221,6 +1221,32 @@ o USB (drivers/usbdev, drivers/usbhost)
                 Apparently the host driver is trashing memory on receipt
                 of data.
 
+                UPDATE:  This behavior needs to be retested with:
+                  commit ce2845c5c3c257d081f624857949a6afd4a4668a
+                  Author: Janne Rosberg <janne.rosberg@offcode.fi>
+                  Date:   Tue Mar 7 06:58:32 2017 -0600
+
+                    usbhost_cdcacm: fix tx outbuffer overflow and remove now
+                    invalid assert
+
+                  commit 3331e9c49aaaa6dcc3aefa6a9e2c80422ffedcd3
+                  Author: Janne Rosberg <janne.rosberg@offcode.fi>
+                  Date:   Tue Mar 7 06:57:06 2017 -0600
+
+                    STM32 OTGHS host:  stm32_in_transfer() fails and returns NAK
+                    if a short transfer is received.  This causes problems from
+                    class drivers like CDC/ACM where short packets are expected.
+                    In those protocols, any transfer may be terminated by sending
+                    short or NUL packet.
+
+                  commit 0631c1aafa76dbaa41b4c37e18db98be47b60481
+                  Author: Gregory Nutt <gnutt@nuttx.org>
+                  Date:   Tue Mar 7 07:17:24 2017 -0600
+
+                    STM32 OTGFS, STM32 L4 and F7: Adapt Janne Rosberg's patch to
+                    STM32 OTGHS host to OTGFS host, and to similar implements for
+                    L4 and F7.
+
               - The SAMA5D EHCI and the LPC31 EHCI drivers both take semaphores
                 in the cancel method.  The current CDC/ACM class driver calls
                 the cancel() method from an interrupt handler.  This will
@@ -1234,9 +1260,12 @@ o USB (drivers/usbdev, drivers/usbhost)
                configurations if you use it.
 
                That all being said, I know of know no issues with the current
-               CDC/ACM driver if the interrupt IN endpoint is not used, i.e.,
-               in "reduced" mode.  The only loss of functionality is output
-               flow control.
+               CDC/ACM driver on the Olimex LPC1766STK platform if the interrupt
+               IN endpoint is not used, i.e., in "reduced" mode.  The only loss
+               of functionality is output flow control.
+
+               UPDATE: The CDC/ACM class driver may also now be functional on
+               the STM32.  That needs to be verified.
 
   Status:      Open
   Priority:    Medium-Low unless you really need host CDC/ACM support.