change default ipfs version to 0.9.0 (/api/v0/dag/export endpoint, custom dns resolvers, new webui, ...)

https://github.com/ipfs/go-ipfs/releases/tag/v0.9.0

Dockerfile

@@ -19,7 +19,7 @@ RUN apt-get update \
     && chown ipfs $IPFS_PATH
 VOLUME $IPFS_PATH
 
-ARG IPFS_VERSION=0.8.0
+ARG IPFS_VERSION=0.9.0
 COPY ipfs-arch.sh /
 ARG INSTALL_DEPENDENCIES="wget ca-certificates"
 RUN apt-get update \