upgrading to opensc 0.20.0 and alpine3.11

Author: cremuzzi

Dockerfile

@@ -1,7 +1,7 @@
-FROM alpine:3.8
+FROM alpine:3.11
 
 ARG LIBP11_VERSION=0.4.10
-ARG OPENSC_VERSION=0.19.0
+ARG OPENSC_VERSION=0.20.0
 
 LABEL maintainer="Carlos Remuzzi <carlosremuzzi@gmail.com>"
 LABEL version=${OPENSC_VERSION}