Upgrade AndroidX lifecycle

- Lint fix for NullSafeMutableLiveData

Author: coin3x

app/build.gradle

@@ -58,7 +58,7 @@ android {
 
 dependencies {
     final def markwon_version = '4.6.2'
-    final def lifecycle_version = '2.3.1'
+    final def lifecycle_version = '2.5.1'
 
     implementation fileTree(dir: 'libs', include: ['*.jar'])
     testImplementation 'junit:junit:4.13.2'