COVIDSafe code from version 1.11.0 (#26)

build.gradle

@@ -1,9 +1,21 @@
-// Top-level build file where you can add configuration options common to all sub-projects/modules.
-
 buildscript {
-    ext.kotlin_version = '1.3.72'
-    ext.retrofit_version = "2.6.2"
-    ext.okhttp_version = "4.4.0"
+    ext {
+        compileSdkVersion = 29
+        buildToolsVersion = "29.0.3"
+        minSdkVersion = 21
+        targetSdkVersion = 28
+
+        kotlin_version = "1.4.0"
+        kotlin_coroutines_version = "1.3.7"
+
+        retrofit_version = "2.9.0"
+        okhttp_version = "4.8.1"
+
+        room_version = "2.2.5"
+
+        androidx_swiperefreshlayout_version = "1.1.0"
+    }
+
     repositories {
         google()
         jcenter()