Update README.md to fix font requirements for Arch Linux
Update README.md to fix font requirements for Arch Linux

The current specifications for installation of Servo in Arch Linux fails to run due to requirement of fonts.

The fix is just to include the required package in the required dependencies list in README.md.

peterjoel/servo,anthgur/servo,upsuper/servo,avadacatavra/servo,thiagopnts/servo,jimberlage/servo,mbrubeck/servo,KiChjang/servo,emilio/servo,notriddle/servo,paulrouget/servo,canaltinova/servo,pyfisch/servo,nnethercote/servo,SimonSapin/servo,splav/servo,saneyuki/servo,larsbergstrom/servo,emilio/servo,splav/servo,saneyuki/servo,mattnenterprise/servo,ConnorGBrewster/servo,sadmansk/servo,SimonSapin/servo,canaltinova/servo,ConnorGBrewster/servo,anthgur/servo,mbrubeck/servo,thiagopnts/servo,nnethercote/servo,thiagopnts/servo,upsuper/servo,peterjoel/servo,notriddle/servo,dati91/servo,paulrouget/servo,thiagopnts/servo,splav/servo,sadmansk/servo,mbrubeck/servo,mbrubeck/servo,mattnenterprise/servo,DominoTree/servo,pyfisch/servo,canaltinova/servo,fiji-flo/servo,splav/servo,DominoTree/servo,mbrubeck/servo,larsbergstrom/servo,nnethercote/servo,notriddle/servo,KiChjang/servo,sadmansk/servo,upsuper/servo,splav/servo,SimonSapin/servo,saneyuki/servo,cbrewster/servo,jimberlage/servo,notriddle/servo,thiagopnts/servo,ConnorGBrewster/servo,fiji-flo/servo,szeged/servo,cbrewster/servo,SimonSapin/servo,sadmansk/servo,upsuper/servo,saneyuki/servo,sadmansk/servo,jimberlage/servo,jimberlage/servo,SimonSapin/servo,dati91/servo,avadacatavra/servo,KiChjang/servo,DominoTree/servo,larsbergstrom/servo,larsbergstrom/servo,nnethercote/servo,cbrewster/servo,peterjoel/servo,saneyuki/servo,sadmansk/servo,nnethercote/servo,KiChjang/servo,cbrewster/servo,emilio/servo,fiji-flo/servo,jimberlage/servo,fiji-flo/servo,peterjoel/servo,ConnorGBrewster/servo,paulrouget/servo,SimonSapin/servo,fiji-flo/servo,paulrouget/servo,thiagopnts/servo,saneyuki/servo,upsuper/servo,sadmansk/servo,ConnorGBrewster/servo,cbrewster/servo,szeged/servo,KiChjang/servo,szeged/servo,mattnenterprise/servo,saneyuki/servo,KiChjang/servo,DominoTree/servo,dati91/servo,emilio/servo,thiagopnts/servo,peterjoel/servo,peterjoel/servo,szeged/servo,upsuper/servo,paulrouget/servo,KiChjang/servo,larsbergstrom/servo,saneyuki/servo,szeged/servo,pyfisch/servo,KiChjang/servo,upsuper/servo,saneyuki/servo,DominoTree/servo,larsbergstrom/servo,avadacatavra/servo,peterjoel/servo,dati91/servo,avadacatavra/servo,emilio/servo,nnethercote/servo,fiji-flo/servo,ConnorGBrewster/servo,DominoTree/servo,jimberlage/servo,nnethercote/servo,canaltinova/servo,DominoTree/servo,ConnorGBrewster/servo,DominoTree/servo,dati91/servo,ConnorGBrewster/servo,saneyuki/servo,avadacatavra/servo,dati91/servo,KiChjang/servo,canaltinova/servo,szeged/servo,anthgur/servo,larsbergstrom/servo,emilio/servo,DominoTree/servo,paulrouget/servo,nnethercote/servo,pyfisch/servo,anthgur/servo,anthgur/servo,splav/servo,paulrouget/servo,mattnenterprise/servo,fiji-flo/servo,pyfisch/servo,mbrubeck/servo,larsbergstrom/servo,mbrubeck/servo,peterjoel/servo,pyfisch/servo,notriddle/servo,nnethercote/servo,anthgur/servo,splav/servo,paulrouget/servo,emilio/servo,canaltinova/servo,notriddle/servo,avadacatavra/servo,emilio/servo,paulrouget/servo,szeged/servo,cbrewster/servo,mattnenterprise/servo,dati91/servo,SimonSapin/servo,notriddle/servo,notriddle/servo,cbrewster/servo,upsuper/servo,pyfisch/servo,mattnenterprise/servo,emilio/servo,splav/servo,anthgur/servo,canaltinova/servo,sadmansk/servo,mbrubeck/servo,peterjoel/servo,thiagopnts/servo,KiChjang/servo,cbrewster/servo,nnethercote/servo,mattnenterprise/servo,anthgur/servo,paulrouget/servo,splav/servo,pyfisch/servo,mattnenterprise/servo,jimberlage/servo,splav/servo,peterjoel/servo,emilio/servo,canaltinova/servo,szeged/servo,avadacatavra/servo,DominoTree/servo,avadacatavra/servo,larsbergstrom/servo,SimonSapin/servo,notriddle/servo,fiji-flo/servo,notriddle/servo,szeged/servo,szeged/servo,dati91/servo,jimberlage/servo,pyfisch/servo,larsbergstrom/servo,pyfisch/servo,jimberlage/servo