Bump pytz from 2018.5 to 2018.7 (#1475)
Bump pytz from 2018.5 to 2018.7 (#1475)

Bumps [pytz](https://github.com/stub42/pytz) from 2018.5 to 2018.7.
<details>
<summary>Commits</summary>

- [`024e877`](https://github.com/stub42/pytz/commit/024e87765ac37cd5b818347c3e6afa98a1e4f5a6) Bump version numbers to 2018.7./2018g
- [`33997e9`](https://github.com/stub42/pytz/commit/33997e9a17fae2ecc9f825eac056e22ea4d5dc27) IANA 2018g
- [`7e33478`](https://github.com/stub42/pytz/commit/7e33478a034ba25464cfbb9b2ee8306174eae2aa) Squashed 'tz/' changes from 7c97eb855..65736cdac
- [`c9df7ae`](https://github.com/stub42/pytz/commit/c9df7ae6222875f943245c14782873c0863fd99c) Add warnings to examples showing what not to do
- [`566ad8a`](https://github.com/stub42/pytz/commit/566ad8ae76418cf6b797a2906c446a9c1382a706) Bump version numbers to 2018.6/2018f
- [`3fd1fec`](https://github.com/stub42/pytz/commit/3fd1fec7e5e10f6911158dbd940ce82ac157a89f) Update dev notes for Ubuntu 18.04 containers
- [`d8741dc`](https://github.com/stub42/pytz/commit/d8741dc3e06d4bae766c1cf7046a12e1042cca3e) Squashed 'tz/' changes from 4758e88f9..fa14997fd
- [`93604a5`](https://github.com/stub42/pytz/commit/93604a504a718c524ca017bef593b8a13830c707) IANA 2018f
- [`ad30bbb`](https://github.com/stub42/pytz/commit/ad30bbbae0ca8cb58f3c016a83a93f386614ccf9) Merge branch 'travis'
- [`afbbf17`](https://github.com/stub42/pytz/commit/afbbf17c247fe6109dddf7ee8e26a179b166f24f) Promote BaseTzInfo to public API for type checking
- Additional commits viewable in [compare view](https://github.com/stub42/pytz/compare/release_2018.5...release_2018.7)
</details>
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[![Dependabot compatibility score](https://api.dependabot.com/badges/compatibility_score?dependency-name=pytz&package-manager=pip&previous-version=2018.5&new-version=2018.7)](https://dependabot.com/compatibility-score.html?dependency-name=pytz&package-manager=pip&previous-version=2018.5&new-version=2018.7)

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