Revert "Update circleci config."

This reverts commit 1022315.

Author: snyuryev

.circleci/config.yml

@@ -42,6 +42,9 @@ jobs:
       - run:
           name: export flutter path
           command: echo 'export PATH="$PATH:`pwd`/flutter/bin"'  >> $BASH_ENV 
+      - run:
+          name: Fetch CocoaPods Specs
+          command: curl https://cocoapods-specs.circleci.com/fetch-cocoapods-repo-from-s3.sh  | bash -s cf
       - run: flutter doctor
       - run: 
           name: Flutter build

examples/alan_simple_app/android/app/build.gradle

@@ -26,8 +26,8 @@ apply plugin: 'kotlin-android'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 30
-     ndkVersion "21.1.6352462"
+    compileSdkVersion 29
+//     ndkVersion "21.1.6352462"
 
     sourceSets {
         main.java.srcDirs += 'src/main/kotlin'
@@ -41,7 +41,7 @@ android {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "app.alan.simpleflutterapp"
         minSdkVersion 21
-        targetSdkVersion 30
+        targetSdkVersion 29
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"