upgrade packages impl and gomodifytags

[karmops]

Accumulative updates since:

1 - `github.com/josharian/impl - v1.1.0`
 - [v1.2.0: avoid name collisions between receiver and params/results](https://github.com/josharian/impl/releases/tag/v1.2.0)
 - [v1.3.0: support generics](https://github.com/josharian/impl/releases/tag/v1.3.0)
 - [v1.4.0: Fix generation failure when multiple type parameters are in the receiver](https://github.com/josharian/impl/releases/tag/v1.4.0)


2 - `github.com/fatih/gomodifytags - v1.16.0`
 - [v1.17.0](https://github.com/fatih/gomodifytags/releases/tag/v1.17.0)
   - Update README.md by @laurixyz in https://github.com/fatih/gomodifytags/pull/90
   - Bump golang.org/x/tools from 0.0.0-20180824175216-6c1c5e93cdc1 to 0.6.0 by https://github.com/dependabot in https://github.com/fatih/gomodifytags/pull/97
   - Bump golang.org/x/tools from 0.6.0 to 0.7.0 by https://github.com/dependabot in https://github.com/fatih/gomodifytags/pull/98
   - chore: use fmt.Errorf(...) instead of errors.New(fmt.Sprintf(...)) by @testwill in https://github.com/fatih/gomodifytags/pull/106
   - add TextMate2 bundle link by @vigo in https://github.com/fatih/gomodifytags/pull/107
   - Dependency and CI updates by @fatih in https://github.com/fatih/gomodifytags/pull/112
   - Don't double up underscores with -transform=snakecase by @arp242 in https://github.com/fatih/gomodifytags/pull/96

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Patch Set 1:

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Message from Hyang-Ah Hana Kim:

Patch Set 1:

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[gopherbot]

This PR is being closed because golang.org/cl/599335 has been abandoned.

This CL have been stale for more than 6 months