Links to sponsors corrected

Author: anatoliykmetyuk

_data/scala-days-sponsors.yml

@@ -17,12 +17,12 @@ sponsors:
   - title: Signify Technology
     type: Platinum
     logo: /resources/img/scala-days-sponsors/signify.png
-    url: https://signify.com
+    url: https://www.signifytechnology.com/
 
   - title: Gradle
     type: Gold
     logo: /resources/img/scala-days-sponsors/gradle.png
-    url: https://gradle.org
+    url: https://gradle.com/
 
   - title: JetBrains
     type: Gold