change version to 3.8.7

gradle.properties

@@ -17,8 +17,8 @@
 # org.gradle.parallel=true
 #android.injected.build.model.only.versioned = 3
 
-VERSION_NAME=3.8.6
-VERSION_CODE=3008006
+VERSION_NAME=3.8.7
+VERSION_CODE=3008007
 ANDROID_COMPILE_SDK_VERSION=30
 ANDROID_MIN_SDK_VERSION=19
 ANDORID_TARGET_SDK_VERSION=28