(GH-9) Update iconUrl to recommendation

Author: gep13

nuspec/nuget/Cake.Webpack.nuspec

@@ -7,7 +7,7 @@
     <owners>Phil Oyston, cake-contrib</owners>
     <licenseUrl>https://github.com/cake-contrib/Cake.Webpack/blob/master/LICENSE</licenseUrl>
     <projectUrl>https://github.com/cake-contrib/Cake.Webpack</projectUrl>
-    <iconUrl>https://cdn.rawgit.com/cake-contrib/graphics/a5cf0f881c390650144b2243ae551d5b9f836196/png/cake-contrib-medium.png</iconUrl>
+    <iconUrl>https://cdn.jsdelivr.net/gh/cake-contrib/graphics/png/cake-contrib-medium.png</iconUrl>
     <requireLicenseAcceptance>false</requireLicenseAcceptance>
     <summary>Adds Webpack helpers for Cake</summary>
     <description>Aliases to assist with running Webpack from Cake build scripts</description>
@@ -18,4 +18,4 @@
     <file src="Cake.Webpack.dll" target="lib\net46" />
     <file src="Cake.Webpack.pdb" target="lib\net46" />
   </files>
-</package>
+</package>