fix icon URL, add release notes notification

Signed-off-by: R4SAS <r4sas@i2pmail.org>

yggdrasil/yggdrasil.nuspec

@@ -10,7 +10,7 @@
     <title>Yggdrasil Network</title>
     <authors>Yggdrasil Network</authors>
     <projectUrl>https://yggdrasil-network.github.io/</projectUrl>
-    <iconUrl>https://github.com/r4sas/chocolatey-packages/blob/master/yggdrasil/icon/yggdrasil-512.png</iconUrl>
+    <iconUrl>https://raw.githubusercontent.com/r4sas/chocolatey-packages/master/yggdrasil/icon/yggdrasil-512.png</iconUrl>
     <licenseUrl>https://github.com/yggdrasil-network/yggdrasil-go/blob/master/LICENSE</licenseUrl>
     <requireLicenseAcceptance>true</requireLicenseAcceptance>
     <projectSourceUrl>https://github.com/yggdrasil-network/yggdrasil-go</projectSourceUrl>
@@ -31,6 +31,7 @@ algorithm based on a globally-agreed spanning tree and greedy routing in a
 metric space, and aims to implement some novel local backpressure routing
 techniques. In theory, Yggdrasil should scale well on networks with
 internet-like topologies.</description>
+    <releaseNotes>Release notes can be found in [changelog](https://github.com/yggdrasil-network/yggdrasil-go/blob/master/CHANGELOG.md).</releaseNotes>
   </metadata>
   <files>
     <file src="tools\**" target="tools" />