Version 4.0.0 for TF 13

Version 3.5.0 for TF 13

v3.4.1 - 2021-01-14

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 * Set instance group size to 0 when num_instances=0 ([#43][issue43])

[issue43]: #43

v3.4.0 - 2021-01-13

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 * Add `startup_script` input variable to specify a bash startup-script to
   execute after routing is initialized.  ([#40][issue40])

v2.1.1 - 2021-01-14

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 * Set instance group size to 0 when num_instances=0 ([#43][issue43])

[issue43]: #43

v2.1.0 - 2021-01-13

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 * Add `startup_script` input variable to specify a bash startup-script to
   execute after routing is initialized.  ([#40][issue40])

v3.3.0 - 2020-12-28

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 * (#7) Monitor the health of IP forwarding.  See [PR
   37](#37)
   for the conditions when auto-healing is triggered in response to kernel
   routing table changes.

v3.2.1 - 2020-12-23

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 * (#28) Fix Error: Invalid prefix for given prefix length

v3.2.0 - 2020-12-23

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 * (#32) Modify update policy to match GKE defaults. (maxSurge=1 maxUnavailable=0)
 * (#35) Remove nic0_cidrs, NIC0_CIDRS, nic1_cidrs, NIC1_CIDRS from 50_compute,
   they are not used inside the instance by policy based routing.

v3.1.1 - 2020-12-23

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 * Fix [issue/27][issue27] `target_size` should not be set with an auto scaler.