Update release_notes.txt w.r.t JS fix #2380 (#2382)

release_notes.txt

@@ -1,8 +1,8 @@
 Aug 15, 2019: v8.10.17
 Metadata changes:
  - MX numbering authority has changed dialling patterns to be more
-   uniform i.e additional doemstic (01 and 044) and international
-   mobile tokens (1) are abolished now. The parsing and formating
+   uniform i.e additional domestic (01 and 044) and international
+   mobile tokens (1) are abolished now. The parsing and formatting
    changes were done as part of this release. We recommend to
    follow the steps mentioned in our announcement for same:
    https://groups.google.com/forum/#!topic/libphonenumber-discuss/pecTIo_HpVE
@@ -10,6 +10,12 @@ Metadata changes:
  - Updated short number metadata for region code(s): TH
  - Updated carrier data for country calling code(s):
    86 (en, zh, zh_Hant), 95 (en), 374 (en, ru)
+For users who depend on JavaScript port:
+ - Please patch in PR #2380 to fix AYTF output that otherwise
+   swallows the entered old mobile token (1) at the last step.
+Code changes:
+ - AsYouTypeFormatter changed to ensure that the output never adds new digits or swallows digits.
+ - MX mobile token no longer returned by getCountryMobileToken
 
 Aug 01, 2019: v8.10.16
 Metadata changes: