added pretty option to json twig filter
added pretty option to json twig filter

ThuyNTran/datawrapper,qqming113/datawrapper,kendrick-k/datawrapper,qqming113/datawrapper,rubensfernando/datawrapper,grepman/datawrapper,qqming113/datawrapper,grepman/datawrapper,plusgut/datawrapper,kendrick-k/datawrapper,grepman/datawrapper,grepman/datawrapper,kendrick-k/datawrapper,kendrick-k/datawrapper,kendrick-k/datawrapper,qqming113/datawrapper,devinit/datawrapper,rubensfernando/datawrapper,datafunk/datawrapper,kendrick-k/datawrapper,datafunk/datawrapper,ThuyNTran/datawrapper,grepman/datawrapper,grepman/datawrapper,qqming113/datawrapper,devinit/datawrapper,devinit/datawrapper,ThuyNTran/datawrapper,qqming113/datawrapper,devinit/datawrapper,rubensfernando/datawrapper,datafunk/datawrapper,rubensfernando/datawrapper,datafunk/datawrapper,ThuyNTran/datawrapper,devinit/datawrapper,plusgut/datawrapper,ThuyNTran/datawrapper,plusgut/datawrapper,ThuyNTran/datawrapper,datafunk/datawrapper,plusgut/datawrapper,devinit/datawrapper,rubensfernando/datawrapper,datafunk/datawrapper