docs: add changelog for 5.1.2
docs: add changelog for 5.1.2

chuckjaz/angular,manekinekko/angular,wKoza/angular,heathkit/angular,gdi2290/angular,hansl/angular,ultrasonicsoft/angular,shairez/angular,mzgol/angular,alxhub/angular,mhevery/angular,IgorMinar/angular,Brocco/angular,mlaval/angular,blesh/angular,LucasSloan/angular,Brocco/angular,mprobst/angular,mhevery/angular,ghetolay/angular,rkirov/angular,robwormald/angular,IgorMinar/angular,jonrimmer/angular,ocombe/angular,filipesilva/angular,jonrimmer/angular,IgorMinar/angular,cironunes/angular,rkirov/angular,mzgol/angular,mgechev/angular,kegluneq/angular,mgol/angular,rkirov/angular,chuckjaz/angular,cironunes/angular,alexeagle/angular,ultrasonicsoft/angular,wKoza/angular,filipesilva/angular,vikerman/angular,juristr/angular,ghetolay/angular,mzgol/angular,vicb/angular,petebacondarwin/angular,alxhub/angular,hansl/angular,gdi2290/angular,vikerman/angular,sarunint/angular,ocombe/angular,filipesilva/angular,mlaval/angular,IgorMinar/angular,robwormald/angular,vsavkin/angular,shairez/angular,cironunes/angular,gnomeontherun/angular,angular/angular,kegluneq/angular,IdeaBlade/angular,Brocco/angular,mgiambalvo/angular,dsebastien/angular,angular-indonesia/angular,aboveyou00/angular,Toxicable/angular,robwormald/angular,brandonroberts/angular,IdeaBlade/angular,mgechev/angular,jasonaden/angular,IdeaBlade/angular,kara/angular,vikerman/angular,angular/angular,shairez/angular,ultrasonicsoft/angular,JiaLiPassion/angular,cironunes/angular,dsebastien/angular,trshafer/angular,Brocco/angular,trshafer/angular,manekinekko/angular,hansl/angular,IgorMinar/angular,Toxicable/angular,vikerman/angular,dsebastien/angular,mgechev/angular,juristr/angular,ghetolay/angular,chuckjaz/angular,mgol/angular,jonrimmer/angular,dsebastien/angular,gdi2290/angular,vsavkin/angular,aboveyou00/angular,mprobst/angular,aboveyou00/angular,kara/angular,LucasSloan/angular,gdi2290/angular,IgorMinar/angular,wKoza/angular,mprobst/angular,vikerman/angular,jasonaden/angular,aboveyou00/angular,sarunint/angular,juristr/angular,wKoza/angular,ocombe/angular,aboveyou00/angular,mgiambalvo/angular,petebacondarwin/angular,alxhub/angular,sarunint/angular,ultrasonicsoft/angular,angular-indonesia/angular,matsko/angular,sarunint/angular,mgiambalvo/angular,matsko/angular,ValtoFrameworks/Angular-2,robwormald/angular,Toxicable/angular,StephenFluin/angular,hansl/angular,snaptech/angular,alexeagle/angular,vikerman/angular,brandonroberts/angular,StephenFluin/angular,Toxicable/angular,sarunint/angular,NathanWalker/angular,heathkit/angular,kegluneq/angular,ghetolay/angular,petebacondarwin/angular,ValtoFrameworks/Angular-2,kegluneq/angular,ocombe/angular,gkalpak/angular,mlaval/angular,kara/angular,kara/angular,gdi2290/angular,brandonroberts/angular,gnomeontherun/angular,mlaval/angular,mgol/angular,trshafer/angular,kara/angular,NathanWalker/angular,cironunes/angular,gkalpak/angular,blesh/angular,blesh/angular,chuckjaz/angular,mgiambalvo/angular,matsko/angular,jonrimmer/angular,rkirov/angular,angular/angular,petebacondarwin/angular,snaptech/angular,petebacondarwin/angular,IdeaBlade/angular,angular-indonesia/angular,chuckjaz/angular,NathanWalker/angular,chuckjaz/angular,jasonaden/angular,Toxicable/angular,mprobst/angular,mhevery/angular,JiaLiPassion/angular,brandonroberts/angular,jasonaden/angular,kara/angular,JiaLiPassion/angular,matsko/angular,JiaLiPassion/angular,LucasSloan/angular,vicb/angular,filipesilva/angular,trshafer/angular,ultrasonicsoft/angular,heathkit/angular,mgechev/angular,matsko/angular,angular-indonesia/angular,angular/angular,vicb/angular,jasonaden/angular,blesh/angular,mhevery/angular,StephenFluin/angular,StephenFluin/angular,ocombe/angular,dsebastien/angular,mgechev/angular,gkalpak/angular,shairez/angular,wKoza/angular,ValtoFrameworks/Angular-2,mgol/angular,kegluneq/angular,gnomeontherun/angular,aboveyou00/angular,cironunes/angular,snaptech/angular,mzgol/angular,mgiambalvo/angular,heathkit/angular,Toxicable/angular,manekinekko/angular,shairez/angular,vicb/angular,alxhub/angular,mgol/angular,dsebastien/angular,trshafer/angular,snaptech/angular,LucasSloan/angular,snaptech/angular,vicb/angular,trshafer/angular,NathanWalker/angular,heathkit/angular,mzgol/angular,LucasSloan/angular,filipesilva/angular,sarunint/angular,rkirov/angular,mgol/angular,NathanWalker/angular,gkalpak/angular,mprobst/angular,vsavkin/angular,jonrimmer/angular,hansl/angular,robwormald/angular,vicb/angular,vsavkin/angular,jasonaden/angular,alexeagle/angular,mhevery/angular,mprobst/angular,gnomeontherun/angular,jonrimmer/angular,ocombe/angular,manekinekko/angular,gdi2290/angular,snaptech/angular,alxhub/angular,NathanWalker/angular,LucasSloan/angular,blesh/angular,robwormald/angular,StephenFluin/angular,manekinekko/angular,ValtoFrameworks/Angular-2,juristr/angular,kegluneq/angular,alexeagle/angular,hansl/angular,brandonroberts/angular,alexeagle/angular,rkirov/angular,mzgol/angular,wKoza/angular,ValtoFrameworks/Angular-2,Brocco/angular,petebacondarwin/angular,heathkit/angular,manekinekko/angular,alexeagle/angular,ultrasonicsoft/angular,mhevery/angular,Brocco/angular,ghetolay/angular,brandonroberts/angular,vsavkin/angular,juristr/angular,juristr/angular,mlaval/angular,IdeaBlade/angular