Travis failing nondeterministically

[JoshCheek]

I'll add links to failed builds here until I've got enough to try identifying a pattern

Freezing up

• https://travis-ci.org/JoshCheek/seeing_is_believing/jobs/168311089 (I restarted this build and it passed, there doesn't seem to be a way to see the old one. IIRC, it ultimately froze in the EventStream tests)
• https://travis-ci.org/JoshCheek/seeing_is_believing/jobs/163011764

  Segfault >.<

These were both on the same build and this is the only time this has ever happened, perhaps it was a fluke? Maybe something to do with Travis rather than my code.

• https://travis-ci.org/JoshCheek/seeing_is_believing/jobs/166095745
• https://travis-ci.org/JoshCheek/seeing_is_believing/jobs/166095744

[JoshCheek]

I think https://github.com/JoshCheek/seeing_is_believing/commit/4f98c62a5aa7c505524ba42c6b70ba3ebea606c5 fixed this.