add v0.6.3 and v0.6.4 to changelog
add v0.6.3 and v0.6.4 to changelog

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