Use kotlin 1.4.31

ligi · ligi · commit 8c980eb75c83 · 2021-03-19T00:37:26.000+01:00
diff --git a/build.gradle b/build.gradle
@@ -1,7 +1,7 @@
 buildscript {
     ext {
         versions = [
-                kotlin                    : "1.3.72",
+                kotlin                    : "1.4.31",
                 moshi                     : '1.8.0',
                 okhttp                    : '3.11.0',
                 jupiter                   : '5.7.0',
