bump to v0.6.13
bump to v0.6.13

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