Update release notes and download link
Update release notes and download link

In particular, make the download link point to the latest release.
Also include the release notes for releases 1.11 and 1.12.
nickeyfff/vimari,lsqtongxin/vimari,tzhongyuan/vimari,ChrisLTD/vimari,lsqtongxin/vimari,rasmusjp/vimari,guyht/vimari,ChrisLTD/vimari,SampleLiao/vimari,rasmusjp/vimari,guyht/vimari,nickeyfff/vimari,SampleLiao/vimari,tzhongyuan/vimari,lparry/vimari,ChrisLTD/vimari,lparry/vimari,guyht/vimari