Update README for v4.15.0 release

Author: developernotes

README.md

@@ -16,14 +16,14 @@ We welcome contributions, to contribute to SQLCipher for Android, a [contributor
 Add a local reference to the local library and dependency:
 
 ```groovy
-implementation files('libs/sqlcipher-android-4.14.0-release.aar')
+implementation files('libs/sqlcipher-android-4.15.0-release.aar')
 implementation 'androidx.sqlite:sqlite:2.6.2'
 ```
 
 or source a Community edition build from Maven Central:
 
 ```groovy
-implementation 'net.zetetic:sqlcipher-android:4.14.0@aar'
+implementation 'net.zetetic:sqlcipher-android:4.15.0@aar'
 implementation 'androidx.sqlite:sqlite:2.6.2'
 ```
 

build.gradle

@@ -33,7 +33,7 @@ project.ext {
     if(project.hasProperty('sqlcipherAndroidVersion') && "${sqlcipherAndroidVersion}") {
         libraryVersion = "${sqlcipherAndroidVersion}"
     } else {
-        libraryVersion = "4.14.1"
+        libraryVersion = "4.15.0"
     }
     minSdkVersion = 23
     androidXSQLiteVersion = "2.6.2"