Correct license link in .nuspec file

Author: brianjmiller

TinCan/TinCan.nuspec

@@ -6,7 +6,7 @@
     <title>$title$</title>
     <authors>$author$</authors>
     <owners>$author$</owners>
-    <licenseUrl>https://github.com/RusticiSoftware/TinCan.NET/LICENSE</licenseUrl>
+    <licenseUrl>https://github.com/RusticiSoftware/TinCan.NET/blob/master/LICENSE</licenseUrl>
     <projectUrl>https://rusticisoftware.github.io/TinCan.NET</projectUrl>
     <iconUrl>http://tincanapi.com/wp-content/assets/icons/tincan-32x32.png</iconUrl>
     <requireLicenseAcceptance>false</requireLicenseAcceptance>