mention that dashes are invalid in 'module_name' variable
mention that dashes are invalid in 'module_name' variable

mapbox/node-pre-gyp,mojodna/node-pre-gyp,etiktin/node-pre-gyp,synthetos/node-pre-gyp,mapbox/node-pre-gyp,fengmk2/node-pre-gyp,synthetos/node-pre-gyp,mojodna/node-pre-gyp,synthetos/node-pre-gyp,etiktin/node-pre-gyp,mapbox/node-pre-gyp,synthetos/node-pre-gyp,synthetos/node-pre-gyp,mojodna/node-pre-gyp,etiktin/node-pre-gyp,mapbox/node-pre-gyp,etiktin/node-pre-gyp,fengmk2/node-pre-gyp,hybridgroup/node-pre-gyp,fengmk2/node-pre-gyp,fengmk2/node-pre-gyp,etiktin/node-pre-gyp,mojodna/node-pre-gyp,hybridgroup/node-pre-gyp,hybridgroup/node-pre-gyp,fengmk2/node-pre-gyp,hybridgroup/node-pre-gyp,mojodna/node-pre-gyp,mapbox/node-pre-gyp