update ChangeLog

Bug: webp:427525168
Change-Id: Ic3542c736a4cea3ec3b6529fe546ce9267295169

update ChangeLog

Bug: b:336795049,webp:380121350
Change-Id: I011bf6c44f89e475f58c6e96f5b68c6ed75a1e22

update ChangeLog

Bug: webp:627
Change-Id: I67a011b62087a8ad64df3b5eb0a1c051adeea60f

update ChangeLog

Bug: webp:620
Change-Id: I5703f222de7262736339dbfd6ba82f2039dfc850

libwebp-1.2.1

- 7/20/2021: version 1.2.1
  This is a binary compatible release.
  * minor lossless encoder improvements and x86 color conversion speed up
  * add ARM64 simulator support to xcframeworkbuild.sh (#510)
  * further security related hardening in libwebp & examples
    (issues: #497, #508, #518)
    (chromium: #1196480, #1196773, #1196775, #1196777, #1196778, #1196850)
    (oss-fuzz: #28658, #28978)
  * toolchain updates and bug fixes (#498, #501, #502, #504, #505, #506, #509,
                                     #533)
  * use more inclusive language within the source (#507)

update ChangeLog

Change-Id: I12c2b718e99087201a57f7ab7cc4c16374e205f6

libwebp-1.2.1-rc2

libwebp-1.2.0

- 12/23/2020: version 1.2.0
  * API changes:
    - libwebp:
      encode.h: add a qmin / qmax range for quality factor (cwebp adds -qrange)
  * lossless encoder improvements
  * SIMD support for Wasm builds
  * add xcframeworkbuild.sh, supports Mac Catalyst builds
  * import fuzzers from oss-fuzz & chromium (#409)
  * webpmux: add an '-set loop <value>' option (#494)
  * toolchain updates and bug fixes (#449, #463, #470, #475, #477, #478, #479,
    #488, #491)

libwebp-1.2.0-rc3

libwebp-1.1.0

- 12/18/2019: version 1.1.0
  * API changes:
    - libwebp:
      WebPMalloc (issue #442)
    - extras:
      WebPUnmultiplyARGB
  * alpha decode fix (issue #439)
  * toolchain updates and bug fixes
    (chromium: #1026858, #1027136, #1027409, #1028620, #1028716, #995200)
    (oss-fuzz: #19430, #19447)