Update README.md

Remove two way warning. Two way mode is the default mode by default now.
Merge pull request #22 from Kloadut/master

[enh] Rebuild client and activate 2way sync + gulpfile fixes + local revision saving
Merge pull request #23 from Kloadut/master

Fix of last PR
Merge pull request #24 from Kloadut/master

[fix] Queue folder documents creation as well
Merge pull request #25 from Kloadut/master

[fix] Delay operations that block FS watching + fix images
Merge branch 'master' of https://github.com/cozy-labs/cozy-data-proxy