fixed nuget package URLs

Author: adamchester

src/Serilog.Sinks.AzureTableStorage/project.json

@@ -5,9 +5,9 @@
     "authors": [ "Robert Moore" ],
     "packOptions": {
         "tags": [ "serilog", "logging", "azure" ],
-        "projectUrl": "http://serilog.net",
+        "projectUrl": "https://github.com/serilog/serilog-sinks-azuretablestorage",
         "licenseUrl": "http://www.apache.org/licenses/LICENSE-2.0",
-        "iconUrl": "http://serilog.net/images/serilog-configuration-nuget.png"
+        "iconUrl": "http://serilog.net/images/serilog-sink-nuget.png"
     },
     "dependencies": {
         "Serilog": "2.0.0",