docs: add changelog for 6.0.0-beta.4
docs: add changelog for 6.0.0-beta.4

sarunint/angular,IdeaBlade/angular,jonrimmer/angular,juristr/angular,rkirov/angular,Brocco/angular,juristr/angular,gnomeontherun/angular,blesh/angular,hansl/angular,alxhub/angular,mlaval/angular,vicb/angular,manekinekko/angular,ValtoFrameworks/Angular-2,robwormald/angular,dsebastien/angular,mhevery/angular,StephenFluin/angular,gkalpak/angular,ultrasonicsoft/angular,vikerman/angular,mlaval/angular,wKoza/angular,IdeaBlade/angular,angular-indonesia/angular,JiaLiPassion/angular,chuckjaz/angular,chuckjaz/angular,Brocco/angular,jonrimmer/angular,trshafer/angular,matsko/angular,Toxicable/angular,sarunint/angular,LucasSloan/angular,LucasSloan/angular,jasonaden/angular,alexeagle/angular,vikerman/angular,gdi2290/angular,robwormald/angular,ultrasonicsoft/angular,JiaLiPassion/angular,chuckjaz/angular,LucasSloan/angular,filipesilva/angular,ultrasonicsoft/angular,StephenFluin/angular,mprobst/angular,matsko/angular,kara/angular,vicb/angular,jonrimmer/angular,Brocco/angular,filipesilva/angular,mgiambalvo/angular,IgorMinar/angular,IdeaBlade/angular,ultrasonicsoft/angular,trshafer/angular,matsko/angular,heathkit/angular,shairez/angular,mgechev/angular,jonrimmer/angular,IgorMinar/angular,kara/angular,cironunes/angular,cironunes/angular,filipesilva/angular,snaptech/angular,jasonaden/angular,ocombe/angular,IgorMinar/angular,angular/angular,matsko/angular,gdi2290/angular,alexeagle/angular,snaptech/angular,dsebastien/angular,blesh/angular,petebacondarwin/angular,angular-indonesia/angular,ValtoFrameworks/Angular-2,brandonroberts/angular,angular/angular,kegluneq/angular,heathkit/angular,brandonroberts/angular,robwormald/angular,brandonroberts/angular,manekinekko/angular,JiaLiPassion/angular,sarunint/angular,gdi2290/angular,mgiambalvo/angular,NathanWalker/angular,IdeaBlade/angular,ValtoFrameworks/Angular-2,mprobst/angular,kara/angular,gkalpak/angular,petebacondarwin/angular,chuckjaz/angular,brandonroberts/angular,wKoza/angular,ValtoFrameworks/Angular-2,gkalpak/angular,gkalpak/angular,dsebastien/angular,robwormald/angular,mgechev/angular,matsko/angular,jasonaden/angular,mgol/angular,vicb/angular,dsebastien/angular,alexeagle/angular,ocombe/angular,alexeagle/angular,heathkit/angular,mprobst/angular,Toxicable/angular,rkirov/angular,LucasSloan/angular,vicb/angular,NathanWalker/angular,jasonaden/angular,IdeaBlade/angular,kara/angular,ultrasonicsoft/angular,hansl/angular,mzgol/angular,cironunes/angular,angular-indonesia/angular,alxhub/angular,NathanWalker/angular,robwormald/angular,vikerman/angular,blesh/angular,cironunes/angular,rkirov/angular,NathanWalker/angular,mprobst/angular,Brocco/angular,mgechev/angular,juristr/angular,shairez/angular,kegluneq/angular,ValtoFrameworks/Angular-2,mlaval/angular,dsebastien/angular,ocombe/angular,Toxicable/angular,trshafer/angular,gdi2290/angular,Toxicable/angular,mhevery/angular,LucasSloan/angular,ocombe/angular,wKoza/angular,NathanWalker/angular,jasonaden/angular,alxhub/angular,alxhub/angular,mzgol/angular,StephenFluin/angular,mgiambalvo/angular,StephenFluin/angular,petebacondarwin/angular,petebacondarwin/angular,juristr/angular,trshafer/angular,kegluneq/angular,ocombe/angular,mhevery/angular,IgorMinar/angular,chuckjaz/angular,hansl/angular,snaptech/angular,cironunes/angular,mgol/angular,shairez/angular,jonrimmer/angular,rkirov/angular,wKoza/angular,mzgol/angular,sarunint/angular,gnomeontherun/angular,kegluneq/angular,mgol/angular,jasonaden/angular,dsebastien/angular,brandonroberts/angular,ultrasonicsoft/angular,mhevery/angular,Brocco/angular,mgol/angular,alexeagle/angular,shairez/angular,trshafer/angular,mzgol/angular,chuckjaz/angular,cironunes/angular,robwormald/angular,blesh/angular,heathkit/angular,vikerman/angular,hansl/angular,wKoza/angular,kegluneq/angular,filipesilva/angular,mzgol/angular,StephenFluin/angular,heathkit/angular,vicb/angular,snaptech/angular,rkirov/angular,LucasSloan/angular,mhevery/angular,IgorMinar/angular,snaptech/angular,filipesilva/angular,mgechev/angular,petebacondarwin/angular,JiaLiPassion/angular,vikerman/angular,mgol/angular,brandonroberts/angular,ocombe/angular,hansl/angular,trshafer/angular,rkirov/angular,mprobst/angular,angular/angular,manekinekko/angular,vikerman/angular,Toxicable/angular,wKoza/angular,manekinekko/angular,mprobst/angular,vicb/angular,gnomeontherun/angular,angular/angular,gdi2290/angular,shairez/angular,mhevery/angular,manekinekko/angular,kegluneq/angular,petebacondarwin/angular,NathanWalker/angular,mgechev/angular,gdi2290/angular,snaptech/angular,sarunint/angular,manekinekko/angular,kara/angular,alxhub/angular,kara/angular,blesh/angular,sarunint/angular,angular-indonesia/angular,mlaval/angular,gnomeontherun/angular,Brocco/angular,IgorMinar/angular,jonrimmer/angular,hansl/angular,mgiambalvo/angular,Toxicable/angular,mlaval/angular,heathkit/angular,juristr/angular,mzgol/angular,alexeagle/angular,juristr/angular,mgiambalvo/angular,mgol/angular