1.2.0 changes.md 

Update changes.md and readme.md 

Update changes.md 

Update changes.md and readme.md 

Release 1.1.9 update changes.md (ReactiveX#4345) 

Update changes.md 

Release 1.1.7 changes.md update (ReactiveX#4184) * Release 1.1.7 changes.md update * Mention last 2 PRs merged

1.x: Release 1.1.6 CHANGES.md (ReactiveX#4008) 

Release 1.1.5 CHANGES.md update (ReactiveX#3913) 

Release 1.1.4 CHANGES.md (ReactiveX#3906)