Upgrade webmock gem to fix tests under Ruby 2.4
Upgrade webmock gem to fix tests under Ruby 2.4

Support for Ruby 2.4 was only added to Webmock in v2.3.1 [1]. Upgrading
to version 2.3.2 fixes the test suite under Ruby 2.4.0 for me locally.

1: https://github.com/bblimke/webmock/blob/1c3d473ddd123f2563a6807f0fc11ab2ef282c71/CHANGELOG.md#231

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