Change from Go 1.6 to 1.9 as 1.6 no longer compiles

How-to-compile-and-build-Stratux-executable.md

@@ -19,8 +19,8 @@ Or directly on the machine, login with username pi password raspberry
     raspi-config --expand-rootfs
     reboot
     cd /root/
-    wget https://dl.google.com/go/go1.6.linux-armv6l.tar.gz
-    tar -zxvf go1.6.linux-armv6l.tar.gz
+    wget https://dl.google.com/go/go1.9.linux-armv6l.tar.gz
+    tar -zxvf go1.9.linux-armv6l.tar.gz
     git clone --recursive https://github.com/cyoung/stratux
     cd stratux
     service stratux stop