Update golang 1.6.2

Signed-off-by: Stefan Scherer <scherer_stefan@icloud.com>

contrib/builder/deb/armhf/raspbian-jessie/Dockerfile

@@ -1,10 +1,13 @@
 FROM resin/rpi-raspbian:jessie
 
+# allow replacing httpredir mirror
+ARG APT_MIRROR=httpredir.debian.org
+RUN sed -i s/httpredir.debian.org/$APT_MIRROR/g /etc/apt/sources.list
+
 RUN apt-get update && apt-get install -y apparmor bash-completion btrfs-tools build-essential curl ca-certificates debhelper dh-apparmor dh-systemd git libapparmor-dev libdevmapper-dev libltdl-dev libsqlite3-dev libsystemd-journal-dev --no-install-recommends && rm -rf /var/lib/apt/lists/*
 
-ENV GO_VERSION 1.4.3
-ENV GOARM 6
-RUN curl -fSL "https://github.com/hypriot/golang-armbuilds/releases/download/v${GO_VERSION}/go${GO_VERSION}.linux-armv6.tar.gz" | tar xzC /usr/local
+ENV GO_VERSION 1.6.2
+RUN curl -fSL "https://storage.googleapis.com/golang/go${GO_VERSION}.linux-armv6l.tar.gz" | tar xzC /usr/local
 ENV PATH $PATH:/usr/local/go/bin
 
 ENV AUTO_GOPATH 1