simplify gradle repositories to fix Android plugin download error

build.gradle

@@ -1,9 +1,6 @@
 buildscript {
     repositories {
-        maven {
+        jcenter()
-            url "https://repo1.maven.org/maven2"
-            jcenter()
-        }
         maven {
             url 'https://maven.google.com/'
             name 'Google'
@@ -16,6 +13,9 @@ buildscript {
 allprojects {
     repositories {
         jcenter()
-        maven { url 'https://maven.google.com' }
+        maven {
+            url 'https://maven.google.com/'
+            name 'Google'
+        }
     }
 }