Update build.gradle

Author: DylanCaiCoding

build.gradle

@@ -7,14 +7,19 @@ buildscript {
             'targetSdkVersion' : 30
     ]
     ext {
+        appcompatVersion = '1.3.1'
         constraintLayoutVersion = '2.1.1'
+        coreVersion = '1.7.0-alpha01'
         espressoVersion = '3.4.0'
         datastoreVersion = '1.0.0'
         kotlinCoroutinesVersion = '1.6.1'
         kotlinVersion = "1.7.0"
         junitExtVersion = '1.1.3'
         junitVersion = '4.13.2'
-        lifecycleLiveDataVersion = '2.3.1'
+        lifecycleVersion = '2.3.1'
+        materialVersion = '1.4.0'
+        rxAndroid2Version = '2.1.1'
+        rxAndroid3Version = '3.0.0'
         startupVersion = '1.1.0'
     }
     repositories {