Revert last four commits (#2337)

Revert last four commits

.travis.yml

@@ -3,14 +3,14 @@ language: android
 android:
   components:
   - build-tools-29.0.2
-  - android-29
+  - android-27
   - extra-android-m2repository
   - extra-google-m2repository
   - extra-android-support
   licenses:
   - android-sdk-license-.+
 before_install:
-- yes | sdkmanager "platforms;android-29" # workaround for accepting the license
+- yes | sdkmanager "platforms;android-27" # workaround for accepting the license
 - if [ "$TRAVIS_PULL_REQUEST" = "false" ]; then
     openssl aes-256-cbc -K $encrypted_5ba4ee4c096f_key -iv $encrypted_5ba4ee4c096f_iv -in "$PWD/.travis/secrets.tar.enc" -out secrets.tar -d;
     tar xf secrets.tar;

common.gradle

@@ -1,5 +1,5 @@
 android {
-    compileSdkVersion 29
+    compileSdkVersion 27
     buildToolsVersion '29.0.2'
 
     buildTypes {
@@ -30,7 +30,7 @@ android {
 
     defaultConfig {
         minSdkVersion 16
-        targetSdkVersion 29
+        targetSdkVersion 27
         applicationIdSuffix pkgNameSuffix
         versionCode extVersionCode
         versionName "$libVersion.$extVersionCode"

lib/ratelimit/build.gradle

@@ -2,12 +2,12 @@ apply plugin: 'com.android.library'
 apply plugin: 'kotlin-android'
 
 android {
-    compileSdkVersion 29
+    compileSdkVersion 27
     buildToolsVersion '29.0.2'
 
     defaultConfig {
         minSdkVersion 16
-        targetSdkVersion 29
+        targetSdkVersion 27
         versionCode 1
         versionName '1.0.0'
     }

src/ko/newtoki/src/eu/kanade/tachiyomi/extension/ko/newtoki/NewToki.kt

@@ -246,7 +246,7 @@ open class NewToki(override val name: String, private val defaultBaseUrl: String
         screen.addPreference(baseUrlPref)
     }
 
-    private fun getPrefBaseUrl(): String = preferences.getString(BASE_URL_PREF, defaultBaseUrl)!!
+    private fun getPrefBaseUrl(): String = preferences.getString(BASE_URL_PREF, defaultBaseUrl)
 
     companion object {
         private const val BASE_URL_PREF_TITLE = "Override BaseUrl"