Add mailing list info to README
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jhannus/cequel,devnut/cequel,devnut/cequel,AdStage/cequel,cequel/cequel,antek-drzewiecki/cequel,zenonas/cequel,cequel/cequel,maxpospischil/cequel,visfleet/cequel,shaqonline/cequel,Galeria-Kaufhof/cequel,lesliev/cequel,elgalu/cequel,edpaget/cequel,AdStage/cequel,datapipe/cequel,datapipe/cequel,backupify/cequel_cql2,lesliev/cequelb,orenmazor/cequel,elgalu/cequel,antek-drzewiecki/cequel,shaqonline/cequel,lesliev/cequel,visfleet/cequel,outoftime/cequel,Galeria-Kaufhof/cequel,jhannus/cequel,bobbrez/cequel,edpaget/cequel,bobbrez/cequel,brewster/cequel,zenonas/cequel,townie/CQL2_cequel,lesliev/cequelb,orenmazor/cequel,maxpospischil/cequel