Patch docker to use valid Go version

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As documented in the README, tailscale only build with the latest Go
version (Go 1.15).  As a result, a handful of undefined errors would pop
up using an older verison.

This patch updates the base image to 1.15, allowing "docker build"
to function correctly once more.

Signed-off-by: Sean Klein <seanmarionklein@gmail.com>

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