Changed appveyor.yml npm install to verbose mode.
Changed appveyor.yml npm install to verbose mode.

JCMais/node-libcurl,JCMais/node-libcurl,smart--petea/node-libcurl,JCMais/node-libcurl,JCMais/node-libcurl,smart--petea/node-libcurl,JCMais/node-libcurl,JCMais/node-libcurl,JCMais/node-libcurl,smart--petea/node-libcurl,smart--petea/node-libcurl