bump to android sdk 28 (#24)

Author: gengjiawen

Dockerfile

@@ -5,8 +5,8 @@ LABEL maintainer="Héctor Ramos <[email protected]>"
 
 # set default build arguments
 ARG SDK_VERSION=sdk-tools-linux-3859397.zip
-ARG ANDROID_BUILD_VERSION=27
-ARG ANDROID_TOOLS_VERSION=27.0.3
+ARG ANDROID_BUILD_VERSION=28
+ARG ANDROID_TOOLS_VERSION=28.0.2
 ARG BUCK_VERSION=2018.10.29.01
 ARG NDK_VERSION=17c
 ARG NODE_VERSION=lts