title: Filoreader Upgradation issue while upgrading Gradle Version of Android APP
body: <p>I am trying to upgrade my android app with latest Gradle version and want to migrate android x, but I am facing the issue, its always show me this message error &quot; compileSdkVersion is not specified. Please add it to build.gradle Affected Modules: folioreader &quot;. Even I try manually add assign compileSdkVersion in the Gradle file of filoreader.</p>
  <pre><code>apply plugin: 'com.android.library'
  apply from: '../config/quality/quality.gradle'
  `enter code here`//apply plugin: 'com.github.dcendents.android-maven'
      
  ext {
      bintrayRepo = 'maven'
      bintrayName = 'folioreader'
      
      publishedGroupId = 'com.folioreader'
      libraryName = 'FolioReader'
      artifact = 'folioreader'
      
      libraryDescription = 'An epub reader for Android'
      
      siteUrl = 'https://github.com/MobilionOSS/FolioReader-Android-M'
      gitUrl = 'https://github.com/MobilionOSS/FolioReader-Android-M.git'
      
      libraryVersion = '0.3.8.2'
      
      developerId = 'mobisystech'
      developerName = 'Folio Reader'
      developerEmail = 'mahavir@codetoart.com'
      
      licenseName = 'FreeBSD License'
      licenseUrl = 'https://en.wikipedia.org/wiki/FreeBSD_Documentation_License#License'
          allLicenses = [&quot;FreeBSD&quot;]
  }
      
  android {
      
      useLibrary 'org.apache.http.legacy'
      
      compileSdkVersion Integer.parseInt(project.ANDROID_TARGET_SDK_VERSION)
         // buildToolsVersion project.ANDROID_BUILD_TOOLS_VERSION
      
      defaultConfig {
          versionCode Integer.parseInt(project.VERSION_CODE)
          versionName project.VERSION_NAME
          minSdkVersion Integer.parseInt(project.ANDROID_MIN_SDK)
          targetSdkVersion Integer.parseInt(project.ANDROID_TARGET_SDK_VERSION)
      }
      
      sourceSets {
          main {
              manifest.srcFile 'AndroidManifest.xml'
              java.srcDirs = ['src/main/java']
              res.srcDirs = ['res']
          }
          test {
              java.srcDirs = ['src/test/java']
          }
      }
      
      compileOptions {
          sourceCompatibility JavaVersion.VERSION_1_8
          targetCompatibility JavaVersion.VERSION_1_8
      }
  
      packagingOptions {
          exclude 'META-INF/ASL2.0'
          exclude 'META-INF/DEPENDENCIES.txt'
          exclude 'META-INF/LICENSE.txt'
          exclude 'META-INF/NOTICE.txt'
          exclude 'META-INF/NOTICE'
          exclude 'META-INF/LICENSE'
          exclude 'META-INF/DEPENDENCIES'
          exclude 'META-INF/notice.txt'
          exclude 'META-INF/license.txt'
          exclude 'META-INF/dependencies.txt'
          exclude 'META-INF/LGPL2.1'
          exclude 'META-INF/services/javax.annotation.processing.Processor'
      }
      
      lintOptions {
          abortOnError false
      }
  
      checkstyle {
          ignoreFailures = true
      }
  }
  
  dependencies {
      implementation fileTree(include: ['*.jar'], dir: 'libs')
      implementation project(':webViewMarker')
  
      final ANDROID_LIB_VERSION = '28.0.0'
  
      //noinspection GradleDependency
      implementation &quot;com.android.support:appcompat-v7:$ANDROID_LIB_VERSION&quot;
      implementation &quot;com.android.support:recyclerview-v7:$ANDROID_LIB_VERSION&quot;
      implementation &quot;com.android.support:support-v4:$ANDROID_LIB_VERSION&quot;
      implementation &quot;com.android.support:design:$ANDROID_LIB_VERSION&quot;
  
      implementation 'com.daimajia.swipelayout:library:1.2.0@aar'
      // r2-streamer
      final R2_STREAMER_VERSION = '0.1.4'
  
      implementation &quot;org.readium:r2-fetcher:$R2_STREAMER_VERSION&quot;
      implementation &quot;org.readium:r2-parser:$R2_STREAMER_VERSION&quot;
      implementation &quot;org.readium:r2-server:$R2_STREAMER_VERSION&quot;
  
      implementation 'org.greenrobot:eventbus:3.1.1'
  }
  
  /*apply from: '../folioreader/bintray/installv1.gradle'
  apply from: '../folioreader/bintray/bintrayv1.gradle'*/ 
  </code></pre>