Update bundler requirement from ~> 1.3 to ~> 2.0

Updates the requirements on bundler to permit the latest version.

Release notes

*Sourced from [bundler's releases](https://github.com/bundler/bundler/releases).* > ## v2.0.1 > Changes: > > - Relaxed RubyGems requirement to `>= 2.5.0` ([#6867](https://github-redirect.dependabot.com/bundler/bundler/pull/6867))

Changelog

*Sourced from [bundler's changelog](https://github.com/bundler/bundler/blob/master/CHANGELOG.md).* > ## 2.0.1 (2019-01-04) > > Changes: > > - Relaxed RubyGems requirement to `>= 2.5.0` ([#6867](https://github-redirect.dependabot.com/bundler/bundler/pull/6867)) > > ## 2.0.0 (2019-01-03) > > No new changes > > ## 2.0.0.pre.3 (2018-12-30) > > Breaking Changes: > > - Bundler 2 now requires RubyGems 3.0.0 at minimum > > Changes: > > - Ruby 2.6 compatibility fixes ([@segiddins](https://github.com/segiddins)) > - Import changes from Bundler 1.17.3 release > > Note: To upgrade your Gemfile to Bundler 2 you will need to run `bundle update --bundler` > > ## 2.0.0.pre.2 (2018-11-27) > > Breaking Changes: > > - `:github` source in the Gemfile now defaults to using HTTPS > > Changes > > - Add compatibility for Bundler merge into ruby-src > > Note: To upgrade your Gemfile to Bundler 2 you will need to run `bundle update --bundler` > > ## 2.0.0.pre.1 (2018-11-09) > > Breaking Changes: > > - Dropped support for versions of Ruby < 2.3 > - Dropped support for version of RubyGems < 2.5 > - Moved error messages from STDOUT to STDERR > > Note: To upgrade your Gemfile to Bundler 2 you will need to run `bundle update --bundler` > > ## 1.17.3 (2018-12-27) > > Bugfixes: > > - Fix a Bundler error when installing gems on old versions of RubyGems ([#6839](https://github-redirect.dependabot.com/bundler/bundler/issues/6839), [@colby](https://github.com/colby)-swandale) > ... (truncated)

Commits

- [`d7ad219`](https://github.com/bundler/bundler/commit/d7ad2192ff5da41ba70ae9c21ca3e62559081df4) Version 2.0.1 with changelog - [`dc06fab`](https://github.com/bundler/bundler/commit/dc06fab418626922b39bfec5178887cb94c8c6de) Merge [#6867](https://github-redirect.dependabot.com/bundler/bundler/issues/6867) - [`31678a3`](https://github.com/bundler/bundler/commit/31678a323f42b48c29cc7c1208205afd3c137087) update tested rubygems in travis - [`81d3ecf`](https://github.com/bundler/bundler/commit/81d3ecf766802f2aab7bb5b6627cd9d597a4eab8) Lower required RubyGems to 2.5 or greater - [`d715ae9`](https://github.com/bundler/bundler/commit/d715ae9e612ad002dbe1b62db59d2abdd0f2dd77) Bundler 2.0 with changelog - [`526bb66`](https://github.com/bundler/bundler/commit/526bb665e5c45c77928da18a5f9b16dbc8281ce3) update CHANGELOG with new changes and release - [`53e4ffa`](https://github.com/bundler/bundler/commit/53e4ffa93c0685357ad7dbe7ab34ad471d742cda) Merge [#6856](https://github-redirect.dependabot.com/bundler/bundler/issues/6856) - [`a0ee4cd`](https://github.com/bundler/bundler/commit/a0ee4cd11d99414d1ef9e9a49c825279fad3aad0) add RubyGems v3.0.1 to rg clone task - [`00caa91`](https://github.com/bundler/bundler/commit/00caa91d13319f55c152aa6df3534b7b3ef1fd17) Version 2.0.0.pre.3 wih changelog - [`13ca000`](https://github.com/bundler/bundler/commit/13ca0004db174440741294db27d41e8adb4adfb9) update tested versions of RubyGems in travis - Additional commits viewable in [compare view](https://github.com/bundler/bundler/compare/v1.3.0...v2.0.1)

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buren / wayback_archiver

Update bundler requirement from ~> 1.3 to ~> 2.0 #30