Added info about browserhtml
Added info about browserhtml

I feel it would make sense to make mention of this here, especially since Browser.html is part of the [road map](https://github.com/servo/servo/wiki/Roadmap) for what we aim to achieve during the year.
paulrouget/servo,KiChjang/servo,larsbergstrom/servo,ConnorGBrewster/servo,emilio/servo,splav/servo,canaltinova/servo,nnethercote/servo,mattnenterprise/servo,emilio/servo,larsbergstrom/servo,peterjoel/servo,canaltinova/servo,DominoTree/servo,notriddle/servo,eddyb/servo,mbrubeck/servo,upsuper/servo,jimberlage/servo,szeged/servo,eddyb/servo,jimberlage/servo,peterjoel/servo,upsuper/servo,upsuper/servo,nnethercote/servo,DominoTree/servo,larsbergstrom/servo,canaltinova/servo,DominoTree/servo,notriddle/servo,mattnenterprise/servo,rnestler/servo,jimberlage/servo,thiagopnts/servo,splav/servo,dati91/servo,splav/servo,CJ8664/servo,avadacatavra/servo,cbrewster/servo,szeged/servo,mattnenterprise/servo,saneyuki/servo,nnethercote/servo,SimonSapin/servo,jimberlage/servo,anthgur/servo,szeged/servo,emilio/servo,szeged/servo,nnethercote/servo,SimonSapin/servo,splav/servo,paulrouget/servo,peterjoel/servo,CJ8664/servo,anthgur/servo,mattnenterprise/servo,larsbergstrom/servo,sadmansk/servo,canaltinova/servo,jimberlage/servo,canaltinova/servo,sadmansk/servo,jimberlage/servo,canaltinova/servo,fiji-flo/servo,jimberlage/servo,mbrubeck/servo,thiagopnts/servo,rnestler/servo,notriddle/servo,KiChjang/servo,mbrubeck/servo,szeged/servo,dsandeephegde/servo,fiji-flo/servo,emilio/servo,notriddle/servo,paulrouget/servo,thiagopnts/servo,jimberlage/servo,saneyuki/servo,mattnenterprise/servo,eddyb/servo,fiji-flo/servo,mattnenterprise/servo,dsandeephegde/servo,dati91/servo,sadmansk/servo,splav/servo,pyfisch/servo,DominoTree/servo,pyfisch/servo,thiagopnts/servo,CJ8664/servo,ConnorGBrewster/servo,notriddle/servo,larsbergstrom/servo,anthgur/servo,sadmansk/servo,rnestler/servo,ConnorGBrewster/servo,rnestler/servo,DominoTree/servo,avadacatavra/servo,saneyuki/servo,paulrouget/servo,dsandeephegde/servo,CJ8664/servo,notriddle/servo,peterjoel/servo,upsuper/servo,dati91/servo,emilio/servo,splav/servo,thiagopnts/servo,peterjoel/servo,szeged/servo,larsbergstrom/servo,CJ8664/servo,thiagopnts/servo,ConnorGBrewster/servo,mbrubeck/servo,pyfisch/servo,fiji-flo/servo,nrc/servo,SimonSapin/servo,sadmansk/servo,ConnorGBrewster/servo,DominoTree/servo,nrc/servo,paulrouget/servo,avadacatavra/servo,splav/servo,fiji-flo/servo,KiChjang/servo,notriddle/servo,szeged/servo,KiChjang/servo,dati91/servo,KiChjang/servo,nrc/servo,saneyuki/servo,peterjoel/servo,emilio/servo,thiagopnts/servo,larsbergstrom/servo,eddyb/servo,canaltinova/servo,nnethercote/servo,jimberlage/servo,rnestler/servo,notriddle/servo,mbrubeck/servo,upsuper/servo,emilio/servo,sadmansk/servo,paulrouget/servo,paulrouget/servo,SimonSapin/servo,nrc/servo,dsandeephegde/servo,rnestler/servo,CJ8664/servo,ConnorGBrewster/servo,KiChjang/servo,upsuper/servo,cbrewster/servo,mbrubeck/servo,DominoTree/servo,dati91/servo,avadacatavra/servo,dsandeephegde/servo,mattnenterprise/servo,anthgur/servo,SimonSapin/servo,upsuper/servo,canaltinova/servo,CJ8664/servo,mattnenterprise/servo,nrc/servo,fiji-flo/servo,peterjoel/servo,DominoTree/servo,pyfisch/servo,szeged/servo,larsbergstrom/servo,SimonSapin/servo,szeged/servo,splav/servo,avadacatavra/servo,szeged/servo,cbrewster/servo,pyfisch/servo,anthgur/servo,eddyb/servo,KiChjang/servo,nnethercote/servo,dati91/servo,sadmansk/servo,emilio/servo,pyfisch/servo,nrc/servo,peterjoel/servo,fiji-flo/servo,cbrewster/servo,SimonSapin/servo,CJ8664/servo,ConnorGBrewster/servo,mbrubeck/servo,peterjoel/servo,ConnorGBrewster/servo,fiji-flo/servo,eddyb/servo,dsandeephegde/servo,upsuper/servo,nrc/servo,dati91/servo,KiChjang/servo,pyfisch/servo,saneyuki/servo,eddyb/servo,pyfisch/servo,rnestler/servo,anthgur/servo,nnethercote/servo,thiagopnts/servo,avadacatavra/servo,nnethercote/servo,notriddle/servo,nnethercote/servo,rnestler/servo,saneyuki/servo,larsbergstrom/servo,dsandeephegde/servo,mbrubeck/servo,eddyb/servo,dsandeephegde/servo,emilio/servo,cbrewster/servo,anthgur/servo,dati91/servo,SimonSapin/servo,splav/servo,cbrewster/servo,DominoTree/servo,cbrewster/servo,saneyuki/servo,anthgur/servo,emilio/servo,paulrouget/servo,paulrouget/servo,nnethercote/servo,splav/servo,avadacatavra/servo,KiChjang/servo,saneyuki/servo,paulrouget/servo,pyfisch/servo,KiChjang/servo,peterjoel/servo,saneyuki/servo,cbrewster/servo,DominoTree/servo,avadacatavra/servo,pyfisch/servo,sadmansk/servo,larsbergstrom/servo,saneyuki/servo,notriddle/servo