Updates readme to document plugin usage
Updates readme to document plugin usage

zsh2938/superagent,eligolding/superagent,KingMario/superagent,reinaldo13/superagent,ertrzyiks/superagent,deltreey/superagent,nemisj/superagent,classdojo/superagent,jarvisaoieong/superagent,brainbytes/superagent,yeatszhang/superagent,brainbytes/superagent,killerlayup/superagent,brotchie/superagent,visionmedia/superagent,h1bomb/superagent,philipshurpik/superagent,mvanlonden/superagent-webpack-client,focusaurus/superagent,modulexcite/superagent,alinz/superagent,wushuyi/superagent,wushuyi/superagent,andyburke/superagent,ccapndave/superagent,ertrzyiks/superagent,andyburke/superagent,thejameskyle/superagent,aaroncrows/superagent,craigspaeth/superagent,visionmedia/superagent,modulexcite/superagent,ccapndave/superagent,visionmedia/superagent,simonvizzini/superagent,soyuka/superagent,reinaldo13/superagent,classdojo/superagent,RubenVerborgh/superagent,puterakahfi/superagent,fredigato/superagent,jarvisaoieong/superagent,eligolding/superagent,yussan/superagent,alinz/superagent,stanzi83/superagent,sutoiku/superagent,h1bomb/superagent,sutoiku/superagent,thejameskyle/superagent,simonvizzini/superagent,KuroGuo/suberagent,stasha/superagent,sebastianvera/superagent,stasha/superagent,soyuka/superagent,sebastianvera/superagent,zsh2938/superagent,fredigato/superagent,yeatszhang/superagent,mvanlonden/superagent-webpack-client,RubenVerborgh/superagent,nemisj/superagent,drinks/superagent,targos/superagent,killerlayup/superagent,geminiyellow/superagent,geminiyellow/superagent,bevacqua/superagent,drinks/superagent,aaroncrows/superagent,craigspaeth/superagent,deltreey/superagent,puterakahfi/superagent,stanzi83/superagent,KingMario/superagent,kmalakoff/superagent-ls,targos/superagent,KuroGuo/suberagent,focusaurus/superagent,kmalakoff/superagent-ls,noikiy/suberagent,noikiy/suberagent,brotchie/superagent,philipshurpik/superagent,yussan/superagent